chore: remove evergreen targets that don't run newer node versions

NODE-2248

Author: mbroadst

.evergreen/config.yml

@@ -785,11 +785,11 @@ buildvariants:
     expansions:
       NODE_LTS_NAME: argon
     tasks: *ref_0
-  - name: debian71-test-dubnium
-    display_name: Debian 7.1 Node Dubnium
+  - name: debian71-test-boron
+    display_name: Debian 7.1 Node Boron
     run_on: debian71-test
     expansions:
-      NODE_LTS_NAME: dubnium
+      NODE_LTS_NAME: boron
     tasks: &ref_1
       - test-3.6-server
       - test-3.6-replica_set
@@ -821,18 +821,6 @@ buildvariants:
       - test-2.6-server-unified
       - test-2.6-replica_set-unified
       - test-2.6-sharded_cluster-unified
-  - name: debian71-test-carbon
-    display_name: Debian 7.1 Node Carbon
-    run_on: debian71-test
-    expansions:
-      NODE_LTS_NAME: carbon
-    tasks: *ref_1
-  - name: debian71-test-boron
-    display_name: Debian 7.1 Node Boron
-    run_on: debian71-test
-    expansions:
-      NODE_LTS_NAME: boron
-    tasks: *ref_1
   - name: debian71-test-argon
     display_name: Debian 7.1 Node Argon
     run_on: debian71-test
@@ -881,18 +869,6 @@ buildvariants:
     expansions:
       NODE_LTS_NAME: argon
     tasks: *ref_2
-  - name: linux-64-amzn-test-dubnium
-    display_name: Amazon Linux (Enterprise) Node Dubnium
-    run_on: linux-64-amzn-test
-    expansions:
-      NODE_LTS_NAME: dubnium
-    tasks: *ref_1
-  - name: linux-64-amzn-test-carbon
-    display_name: Amazon Linux (Enterprise) Node Carbon
-    run_on: linux-64-amzn-test
-    expansions:
-      NODE_LTS_NAME: carbon
-    tasks: *ref_1
   - name: linux-64-amzn-test-boron
     display_name: Amazon Linux (Enterprise) Node Boron
     run_on: linux-64-amzn-test

.evergreen/generate_evergreen_tasks.js

@@ -27,7 +27,8 @@ const OPERATING_SYSTEMS = [
     name: 'debian71-test',
     display_name: 'Debian 7.1',
     run_on: 'debian71-test',
-    mongoVersion: '<4.0'
+    mongoVersion: '<4.0',
+    nodeVersions: ['argon', 'boron']
   },
   {
     name: 'debian81-test',
@@ -47,7 +48,8 @@ const OPERATING_SYSTEMS = [
     name: 'linux-64-amzn-test',
     display_name: 'Amazon Linux (Enterprise)',
     run_on: 'linux-64-amzn-test',
-    mongoVersion: '<4.0'
+    mongoVersion: '<4.0',
+    nodeVersions: ['argon', 'boron']
   },
   // macos
   {
@@ -225,12 +227,12 @@ OPERATING_SYSTEMS.forEach(
     display_name: osDisplayName,
     run_on,
     mongoVersion = '>=2.6',
-    nodeVersion = 'argon'
+    nodeVersions = NODE_VERSIONS
   }) => {
-    const nodeVersions = NODE_VERSIONS.filter(nv => nv >= nodeVersion);
+    const testedNodeVersions = NODE_VERSIONS.filter(version => nodeVersions.includes(version));
     const tasks = getTaskList(mongoVersion);
 
-    nodeVersions.forEach(NODE_LTS_NAME => {
+    testedNodeVersions.forEach(NODE_LTS_NAME => {
       const nodeLtsDisplayName = `Node ${NODE_LTS_NAME[0].toUpperCase()}${NODE_LTS_NAME.substr(1)}`;
       const name = `${osName}-${NODE_LTS_NAME}`;
       const display_name = `${osDisplayName} ${nodeLtsDisplayName}`;