Expand the concept of the homeDir on Windows

[ericpromislow]

Allow env vars HOME, HOMEDRIVE/HOMEPATH, and USERCONFIG to all
denote a possible home directory (call these home-ish directories).

Favour an existing .kube/config file

Favour existing, writable home-ish directories

And finally favour existing home-ish directories (which at this
point aren't writable, but that's how the Kubernetes go-client
does it).

Use the same determination of the .kube/config-based home dir on Windows
that the Kubernetes go-client uses

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• ✅ Eric Promislow (f6c1b34)

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[ericpromislow]

/assign @brendandburns
/retest

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/assign @brendandburns
/retest

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[brendandburns]

/lgtm
/approve

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This pull-request has been approved by: brendandburns, ericpromislow

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