fatal error: concurrent map read and map write when working with the daemon

## Bug Report

I do not know how this has happened.

```
arduino-cli daemon -v --log-level info --format json --log-format json
fatal error: concurrent map read and map write

goroutine 29 [running]:
runtime.throw(0x48440d1, 0x21)
        /usr/local/go/src/runtime/panic.go:617 +0x72 fp=0xc00014dca0 sp=0xc00014dc70 pc=0x402dba2
runtime.mapaccess1_faststr(0x47ee540, 0xc0000b5020, 0x4830cbf, 0xa, 0xc00014dd70)
        /usr/local/go/src/runtime/map_faststr.go:21 +0x469 fp=0xc00014dd10 sp=0xc00014dca0 pc=0x4014129
net/http.http2isConnectionCloseRequest(...)
        /usr/local/go/src/net/http/h2_bundle.go:8937
net/http.(*http2clientConnReadLoop).endStreamError(0xc00014dfb8, 0xc000d13b80, 0x492cc40, 0xc000080030)
        /usr/local/go/src/net/http/h2_bundle.go:8571 +0x11a fp=0xc00014dd80 sp=0xc00014dd10 pc=0x431f06a
net/http.(*http2clientConnReadLoop).endStream(...)
        /usr/local/go/src/net/http/h2_bundle.go:8562
net/http.(*http2clientConnReadLoop).processData(0xc00014dfb8, 0xc001d56360, 0xc001d56360, 0x0)
        /usr/local/go/src/net/http/h2_bundle.go:8552 +0x2b2 fp=0xc00014de38 sp=0xc00014dd80 pc=0x431ead2
net/http.(*http2clientConnReadLoop).run(0xc00014dfb8, 0x4863740, 0xc0002647b8)
        /usr/local/go/src/net/http/h2_bundle.go:8137 +0x5eb fp=0xc00014df70 sp=0xc00014de38 pc=0x431c72b
net/http.(*http2ClientConn).readLoop(0xc00009ec00)
        /usr/local/go/src/net/http/h2_bundle.go:8030 +0x76 fp=0xc00014dfd8 sp=0xc00014df70 pc=0x431ba86
runtime.goexit()
        /usr/local/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00014dfe0 sp=0xc00014dfd8 pc=0x405a661
created by net/http.(*http2Transport).newClientConn
        /usr/local/go/src/net/http/h2_bundle.go:7093 +0x637

goroutine 1 [IO wait, 8 minutes]:
internal/poll.runtime_pollWait(0x50b3ea8, 0x72, 0x0)
        /usr/local/go/src/runtime/netpoll.go:182 +0x56
internal/poll.(*pollDesc).wait(0xc0001e4998, 0x72, 0x0, 0x0, 0x482d2fa)
        /usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x9b
internal/poll.(*pollDesc).waitRead(...)
        /usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Accept(0xc0001e4980, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
        /usr/local/go/src/internal/poll/fd_unix.go:384 +0x1ba
net.(*netFD).accept(0xc0001e4980, 0xc000539401, 0x0, 0x0)
        /usr/local/go/src/net/fd_unix.go:238 +0x42
net.(*TCPListener).accept(0xc0000c25c0, 0xc0000dbb70, 0xc0000dbb78, 0x18)
        /usr/local/go/src/net/tcpsock_posix.go:139 +0x32
net.(*TCPListener).Accept(0xc0000c25c0, 0x4863118, 0xc0000c6180, 0x4945fe0, 0xc0005394c0)
        /usr/local/go/src/net/tcpsock.go:260 +0x48
google.golang.org/grpc.(*Server).Serve(0xc0000c6180, 0x493c0a0, 0xc0000c25c0, 0x0, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:587 +0x1e9
github.com/arduino/arduino-cli/cli/daemon.runDaemonCommand(0xc00020b400, 0xc0001f4d20, 0x0, 0x7)
        /__w/arduino-cli/arduino-cli/cli/daemon/daemon.go:74 +0x44e
github.com/spf13/cobra.(*Command).execute(0xc00020b400, 0xc0001f4cb0, 0x7, 0x7, 0xc00020b400, 0xc0001f4cb0)
        /github/home/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:830 +0x2ae
github.com/spf13/cobra.(*Command).ExecuteC(0x4ea4300, 0x46973b1, 0xc0001fdf88, 0xc00003c0b8)
        /github/home/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:914 +0x2fc
github.com/spf13/cobra.(*Command).Execute(...)
        /github/home/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864
main.main()
        /__w/arduino-cli/arduino-cli/main.go:28 +0x2e

goroutine 4 [syscall, 8 minutes]:
os/signal.signal_recv(0x0)
        /usr/local/go/src/runtime/sigqueue.go:139 +0x9f
os/signal.loop()
        /usr/local/go/src/os/signal/signal_unix.go:23 +0x22
created by os/signal.init.0
        /usr/local/go/src/os/signal/signal_unix.go:29 +0x41

goroutine 6 [select, 8 minutes]:
google.golang.org/grpc/internal/transport.(*controlBuffer).get(0xc0000c9bc0, 0x1, 0x0, 0x0, 0x0, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/controlbuf.go:317 +0x104
google.golang.org/grpc/internal/transport.(*loopyWriter).run(0xc0000c4ba0, 0x0, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/controlbuf.go:435 +0x1b6
google.golang.org/grpc/internal/transport.newHTTP2Server.func2(0xc0000c6780)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:276 +0xcb
created by google.golang.org/grpc/internal/transport.newHTTP2Server
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:273 +0xfba

goroutine 7 [select, 8 minutes]:
google.golang.org/grpc/internal/transport.(*http2Server).keepalive(0xc0000c6780)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:935 +0x1ed
created by google.golang.org/grpc/internal/transport.newHTTP2Server
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:282 +0xfdf

goroutine 8 [IO wait, 8 minutes]:
internal/poll.runtime_pollWait(0x50b3dd8, 0x72, 0xffffffffffffffff)
        /usr/local/go/src/runtime/netpoll.go:182 +0x56
internal/poll.(*pollDesc).wait(0xc0000ee698, 0x72, 0x8000, 0x8000, 0xffffffffffffffff)
        /usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x9b
internal/poll.(*pollDesc).waitRead(...)
        /usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Read(0xc0000ee680, 0xc00023a000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
        /usr/local/go/src/internal/poll/fd_unix.go:169 +0x1f2
net.(*netFD).Read(0xc0000ee680, 0xc00023a000, 0x8000, 0x8000, 0x0, 0x800010601, 0x0)
        /usr/local/go/src/net/fd_unix.go:202 +0x4f
net.(*conn).Read(0xc000010118, 0xc00023a000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
        /usr/local/go/src/net/net.go:177 +0x69
bufio.(*Reader).Read(0xc0000c4b40, 0xc0001e21f8, 0x9, 0x9, 0xc09ba4f0e6, 0xc0004ce000, 0xc000078d88)
        /usr/local/go/src/bufio/bufio.go:223 +0x23e
io.ReadAtLeast(0x492c940, 0xc0000c4b40, 0xc0001e21f8, 0x9, 0x9, 0x9, 0xbf58aaa0dd81d540, 0x14c5588197, 0x4eb07c0)
        /usr/local/go/src/io/io.go:310 +0x88
io.ReadFull(...)
        /usr/local/go/src/io/io.go:329
golang.org/x/net/http2.readFrameHeader(0xc0001e21f8, 0x9, 0x9, 0x492c940, 0xc0000c4b40, 0x0, 0x0, 0xc0001d6640, 0x7070e0910100402)
        /github/home/go/pkg/mod/golang.org/x/net@v0.0.0-20190311183353-d8887717615a/http2/frame.go:237 +0x88
golang.org/x/net/http2.(*Framer).ReadFrame(0xc0001e21c0, 0xc000364d20, 0xc000364d20, 0x0, 0x0)
        /github/home/go/pkg/mod/golang.org/x/net@v0.0.0-20190311183353-d8887717615a/http2/frame.go:492 +0xa1
google.golang.org/grpc/internal/transport.(*http2Server).HandleStreams(0xc0000c6780, 0xc00017f410, 0x4863170)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:431 +0x7c
google.golang.org/grpc.(*Server).serveStreams(0xc0000c6180, 0x4946b20, 0xc0000c6780)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:713 +0xdd
google.golang.org/grpc.(*Server).handleRawConn.func1(0xc0000c6180, 0x4946b20, 0xc0000c6780)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:675 +0x43
created by google.golang.org/grpc.(*Server).handleRawConn
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:674 +0x580

goroutine 591 [IO wait]:
internal/poll.runtime_pollWait(0x50b3b68, 0x72, 0xffffffffffffffff)
        /usr/local/go/src/runtime/netpoll.go:182 +0x56
internal/poll.(*pollDesc).wait(0xc001232518, 0x72, 0x8000, 0x8000, 0xffffffffffffffff)
        /usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x9b
internal/poll.(*pollDesc).waitRead(...)
        /usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Read(0xc001232500, 0xc001c7c000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
        /usr/local/go/src/internal/poll/fd_unix.go:169 +0x1f2
net.(*netFD).Read(0xc001232500, 0xc001c7c000, 0x8000, 0x8000, 0x0, 0x800010601, 0x0)
        /usr/local/go/src/net/fd_unix.go:202 +0x4f
net.(*conn).Read(0xc0005394c0, 0xc001c7c000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
        /usr/local/go/src/net/net.go:177 +0x69
bufio.(*Reader).Read(0xc0015acf60, 0xc0003ac118, 0x9, 0x9, 0xc024639697, 0xc0004be000, 0xc00007bd88)
        /usr/local/go/src/bufio/bufio.go:223 +0x23e
io.ReadAtLeast(0x492c940, 0xc0015acf60, 0xc0003ac118, 0x9, 0x9, 0x9, 0xbf58ab054d587930, 0x724e281d98, 0x4eb07c0)
        /usr/local/go/src/io/io.go:310 +0x88
io.ReadFull(...)
        /usr/local/go/src/io/io.go:329
golang.org/x/net/http2.readFrameHeader(0xc0003ac118, 0x9, 0x9, 0x492c940, 0xc0015acf60, 0x0, 0x0, 0xc001c382d0, 0x7070e0910100402)
        /github/home/go/pkg/mod/golang.org/x/net@v0.0.0-20190311183353-d8887717615a/http2/frame.go:237 +0x88
golang.org/x/net/http2.(*Framer).ReadFrame(0xc0003ac0e0, 0xc003f45380, 0xc003f45380, 0x0, 0x0)
        /github/home/go/pkg/mod/golang.org/x/net@v0.0.0-20190311183353-d8887717615a/http2/frame.go:492 +0xa1
google.golang.org/grpc/internal/transport.(*http2Server).HandleStreams(0xc0004af980, 0xc001211890, 0x4863170)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:431 +0x7c
google.golang.org/grpc.(*Server).serveStreams(0xc0000c6180, 0x4946b20, 0xc0004af980)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:713 +0xdd
google.golang.org/grpc.(*Server).handleRawConn.func1(0xc0000c6180, 0x4946b20, 0xc0004af980)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:675 +0x43
created by google.golang.org/grpc.(*Server).handleRawConn
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:674 +0x580

goroutine 589 [select]:
google.golang.org/grpc/internal/transport.(*controlBuffer).get(0xc00115a800, 0x1, 0x0, 0x0, 0x0, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/controlbuf.go:317 +0x104
google.golang.org/grpc/internal/transport.(*loopyWriter).run(0xc0015acfc0, 0x0, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/controlbuf.go:435 +0x1b6
google.golang.org/grpc/internal/transport.newHTTP2Server.func2(0xc0004af980)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:276 +0xcb
created by google.golang.org/grpc/internal/transport.newHTTP2Server
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:273 +0xfba

goroutine 590 [select, 8 minutes]:
google.golang.org/grpc/internal/transport.(*http2Server).keepalive(0xc0004af980)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:935 +0x1ed
created by google.golang.org/grpc/internal/transport.newHTTP2Server
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/internal/transport/http2_server.go:282 +0xfdf

goroutine 2911 [select]:
net/http.(*http2ClientConn).roundTrip(0xc00009ec00, 0xc0001cda00, 0x0, 0x0, 0x0, 0x0)
        /usr/local/go/src/net/http/h2_bundle.go:7504 +0x8cc
net/http.(*http2Transport).RoundTripOpt(0xc0004dc240, 0xc0001cda00, 0xc0003eb100, 0x4327286, 0x0, 0xc0001ce7e0)
        /usr/local/go/src/net/http/h2_bundle.go:6867 +0x159
net/http.(*http2Transport).RoundTrip(...)
        /usr/local/go/src/net/http/h2_bundle.go:6829
net/http.http2noDialH2RoundTripper.RoundTrip(0xc0004dc240, 0xc0001cda00, 0xc001aeb6e0, 0x5, 0xc0001ce868)
        /usr/local/go/src/net/http/h2_bundle.go:8959 +0x3f
net/http.(*Transport).roundTrip(0x4ea37a0, 0xc0001cda00, 0x10, 0xc001f8ee60, 0xc0003eb480)
        /usr/local/go/src/net/http/transport.go:430 +0xe90
net/http.(*Transport).RoundTrip(0x4ea37a0, 0xc0001cda00, 0x4ea37a0, 0x0, 0x0)
        /usr/local/go/src/net/http/roundtrip.go:17 +0x35
net/http.send(0xc0001cda00, 0x492de20, 0x4ea37a0, 0x0, 0x0, 0x0, 0xc0000ca938, 0xc0003eb6a8, 0x1, 0x0)
        /usr/local/go/src/net/http/client.go:250 +0x461
net/http.(*Client).send(0x4eaf480, 0xc0001cda00, 0x0, 0x0, 0x0, 0xc0000ca938, 0x0, 0x1, 0xc00009c400)
        /usr/local/go/src/net/http/client.go:174 +0xfb
net/http.(*Client).do(0x4eaf480, 0xc0001cda00, 0x0, 0x0, 0x0)
        /usr/local/go/src/net/http/client.go:641 +0x279
net/http.(*Client).Do(...)
        /usr/local/go/src/net/http/client.go:509
github.com/arduino/arduino-cli/commands/board.apiByVidPid(0xc001aeb6e0, 0x2f, 0xc0003ebac0, 0x2, 0x2, 0xc001aeb6e0, 0x2f)
        /__w/arduino-cli/arduino-cli/commands/board/list.go:46 +0x1a3
github.com/arduino/arduino-cli/commands/board.List(0x2, 0x0, 0x0, 0x0, 0x0, 0x0)
        /__w/arduino-cli/arduino-cli/commands/board/list.go:116 +0x87f
github.com/arduino/arduino-cli/commands/daemon.(*ArduinoCoreServerImpl).BoardList(0xc0001c6e00, 0x493eaa0, 0xc003860720, 0xc003860750, 0xc0001c6e00, 0xc003860720, 0xc000372ba8)
        /__w/arduino-cli/arduino-cli/commands/daemon/daemon.go:52 +0x47
github.com/arduino/arduino-cli/rpc/commands._ArduinoCore_BoardList_Handler(0x480f300, 0xc0001c6e00, 0x493eaa0, 0xc003860720, 0xc001d5f9a0, 0x0, 0x493eaa0, 0xc003860720, 0xc002c2dfa0, 0x4)
        /__w/arduino-cli/arduino-cli/rpc/commands/commands.pb.go:1551 +0x23e
google.golang.org/grpc.(*Server).processUnaryRPC(0xc0000c6180, 0x4946b20, 0xc0004af980, 0xc005b3d700, 0xc000220750, 0x4ea3700, 0x0, 0x0, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:998 +0x470
google.golang.org/grpc.(*Server).handleStream(0xc0000c6180, 0x4946b20, 0xc0004af980, 0xc005b3d700, 0x0)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:1278 +0xda6
google.golang.org/grpc.(*Server).serveStreams.func1.1(0xc000eea400, 0xc0000c6180, 0x4946b20, 0xc0004af980, 0xc005b3d700)
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:717 +0x9f
created by google.golang.org/grpc.(*Server).serveStreams.func1
        /github/home/go/pkg/mod/google.golang.org/grpc@v1.21.1/server.go:715 +0xa1

    at ChildProcess.exithandler (child_process.js:299:12)
    at ChildProcess.emit (events.js:182:13)
    at maybeClose (internal/child_process.js:962:16)
    at Socket.stream.socket.on (internal/child_process.js:381:11)
    at Socket.emit (events.js:182:13)
    at Pipe._handle.close (net.js:606:12)
```

- CLI version (output of `arduino-cli version`):
`arduino-cli Version: 0.3.7-alpha.preview Commit: ac85e06`
- OS and platform:
macOS `10.14.6 (18G87)`

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fatal error: concurrent map read and map write when working with the daemon #414

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