chore: remove exotic build configurations

By default the driver doesn't actually build any code that would
require us testing on these platforms, we only need to test in our
dependencies such as `kerberos`, `snappy` and `bson-ext`.

Author: mbroadst

.evergreen/config.yml

@@ -940,9 +940,9 @@ buildvariants:
     expansions:
       NODE_LTS_NAME: argon
     tasks: *ref_2
-  - name: rhel71-power8-test-dubnium
-    display_name: RHEL 7.1 (POWER8) Node Dubnium
-    run_on: rhel71-power8-test
+  - name: suse12-x86-64-test-dubnium
+    display_name: SUSE 12 (x86_64) Node Dubnium
+    run_on: suse12-test
     expansions:
       NODE_LTS_NAME: dubnium
     tasks: &ref_3
@@ -983,30 +983,6 @@ buildvariants:
       - test-3.2-replica_set-unified
       - test-3.2-sharded_cluster-unified
       - test-atlas-connectivity
-  - name: rhel71-power8-test-carbon
-    display_name: RHEL 7.1 (POWER8) Node Carbon
-    run_on: rhel71-power8-test
-    expansions:
-      NODE_LTS_NAME: carbon
-    tasks: *ref_3
-  - name: rhel71-power8-test-boron
-    display_name: RHEL 7.1 (POWER8) Node Boron
-    run_on: rhel71-power8-test
-    expansions:
-      NODE_LTS_NAME: boron
-    tasks: *ref_3
-  - name: rhel71-power8-test-argon
-    display_name: RHEL 7.1 (POWER8) Node Argon
-    run_on: rhel71-power8-test
-    expansions:
-      NODE_LTS_NAME: argon
-    tasks: *ref_3
-  - name: suse12-x86-64-test-dubnium
-    display_name: SUSE 12 (x86_64) Node Dubnium
-    run_on: suse12-test
-    expansions:
-      NODE_LTS_NAME: dubnium
-    tasks: *ref_3
   - name: suse12-x86-64-test-carbon
     display_name: SUSE 12 (x86_64) Node Carbon
     run_on: suse12-test
@@ -1106,88 +1082,3 @@ buildvariants:
       NODE_LTS_NAME: boron
       CLIENT_ENCRYPTION: true
     tasks: *ref_3
-  - name: ubuntu1604-arm64-small-dubnium
-    display_name: Ubuntu 16.04 (ARM64) Node Dubnium
-    run_on: ubuntu1604-arm64-small
-    expansions:
-      NODE_LTS_NAME: dubnium
-    tasks: *ref_1
-  - name: ubuntu1604-arm64-small-carbon
-    display_name: Ubuntu 16.04 (ARM64) Node Carbon
-    run_on: ubuntu1604-arm64-small
-    expansions:
-      NODE_LTS_NAME: carbon
-    tasks: *ref_1
-  - name: ubuntu1604-arm64-small-boron
-    display_name: Ubuntu 16.04 (ARM64) Node Boron
-    run_on: ubuntu1604-arm64-small
-    expansions:
-      NODE_LTS_NAME: boron
-    tasks: *ref_1
-  - name: ubuntu1604-arm64-small-argon
-    display_name: Ubuntu 16.04 (ARM64) Node Argon
-    run_on: ubuntu1604-arm64-small
-    expansions:
-      NODE_LTS_NAME: argon
-    tasks: *ref_1
-  - name: ubuntu1604-power8-test-dubnium
-    display_name: Ubuntu 16.04 (POWER8) Node Dubnium
-    run_on: ubuntu1604-power8-test
-    expansions:
-      NODE_LTS_NAME: dubnium
-    tasks: *ref_1
-  - name: ubuntu1604-power8-test-carbon
-    display_name: Ubuntu 16.04 (POWER8) Node Carbon
-    run_on: ubuntu1604-power8-test
-    expansions:
-      NODE_LTS_NAME: carbon
-    tasks: *ref_1
-  - name: ubuntu1604-power8-test-boron
-    display_name: Ubuntu 16.04 (POWER8) Node Boron
-    run_on: ubuntu1604-power8-test
-    expansions:
-      NODE_LTS_NAME: boron
-    tasks: *ref_1
-  - name: ubuntu1604-power8-test-argon
-    display_name: Ubuntu 16.04 (POWER8) Node Argon
-    run_on: ubuntu1604-power8-test
-    expansions:
-      NODE_LTS_NAME: argon
-    tasks: *ref_1
-  - name: ubuntu1804-arm64-test-dubnium
-    display_name: Ubuntu 18.04 (ARM64) Node Dubnium
-    run_on: ubuntu1804-arm64-test
-    expansions:
-      NODE_LTS_NAME: dubnium
-    tasks: &ref_5
-      - test-latest-server
-      - test-latest-replica_set
-      - test-latest-sharded_cluster
-      - test-latest-server-unified
-      - test-latest-replica_set-unified
-      - test-latest-sharded_cluster-unified
-      - test-4.2-server
-      - test-4.2-replica_set
-      - test-4.2-sharded_cluster
-      - test-4.2-server-unified
-      - test-4.2-replica_set-unified
-      - test-4.2-sharded_cluster-unified
-      - test-atlas-connectivity
-  - name: ubuntu1804-arm64-test-carbon
-    display_name: Ubuntu 18.04 (ARM64) Node Carbon
-    run_on: ubuntu1804-arm64-test
-    expansions:
-      NODE_LTS_NAME: carbon
-    tasks: *ref_5
-  - name: ubuntu1804-arm64-test-boron
-    display_name: Ubuntu 18.04 (ARM64) Node Boron
-    run_on: ubuntu1804-arm64-test
-    expansions:
-      NODE_LTS_NAME: boron
-    tasks: *ref_5
-  - name: ubuntu1804-arm64-test-argon
-    display_name: Ubuntu 18.04 (ARM64) Node Argon
-    run_on: ubuntu1804-arm64-test
-    expansions:
-      NODE_LTS_NAME: argon
-    tasks: *ref_5

.evergreen/generate_evergreen_tasks.js

@@ -28,13 +28,6 @@ const OPERATING_SYSTEMS = [
     run_on: 'debian81-test',
     mongoVersion: '>=3.4 <4.2'
   },
-  // TODO: once we know how to test debian 9.x
-  // {
-  //   name: 'debian91-test',
-  //   display_name: 'Debian 9.1',
-  //   run_on: 'debian91-test',
-  //   mongoVersion: '>=4.0'
-  // },
   // Amazon Linux
   {
     name: 'linux-64-amzn-test',
@@ -56,12 +49,6 @@ const OPERATING_SYSTEMS = [
     display_name: 'RHEL 7.0',
     run_on: 'rhel70-small'
   },
-  {
-    name: 'rhel71-power8-test',
-    display_name: 'RHEL 7.1 (POWER8)',
-    run_on: 'rhel71-power8-test',
-    mongoVersion: '>=3.2'
-  },
   //suse
   {
     name: 'suse12-x86-64-test',
@@ -84,32 +71,6 @@ const OPERATING_SYSTEMS = [
     clientEncryption: true,
     nodeVersions: ['dubnium', 'carbon', 'boron']
   },
-  {
-    name: 'ubuntu1604-arm64-small',
-    display_name: 'Ubuntu 16.04 (ARM64)',
-    run_on: 'ubuntu1604-arm64-small',
-    mongoVersion: '>=3.4 <4.2'
-  },
-  {
-    name: 'ubuntu1604-power8-test',
-    display_name: 'Ubuntu 16.04 (POWER8)',
-    run_on: 'ubuntu1604-power8-test',
-    mongoVersion: '>=3.4 <4.2'
-  },
-  {
-    name: 'ubuntu1804-arm64-test',
-    display_name: 'Ubuntu 18.04 (ARM64)',
-    run_on: 'ubuntu1804-arm64-test',
-    mongoVersion: '>=4.2'
-  }
-
-  // reenable when these are actually running 7.2, or we release a 7.4 rpm
-  // {
-  //   name: 'rhel72-zseries-test',
-  //   display_name: 'RHEL 7.2 (zSeries)',
-  //   run_on: 'rhel72-zseries-test',
-  //   mongoVersion: '>=3.4'
-  // },
 
   // Windows. reenable this when nvm supports windows, or we settle on an alternative tool
   // {