test(NODE-3777): fix custom fle tests

Author: durran

.evergreen/config.yml

@@ -1717,6 +1717,7 @@ tasks:
         vars:
           VERSION: '5.0'
           TOPOLOGY: server
+      - func: bootstrap kms servers
       - func: run custom csfle tests
   - name: run-custom-snappy-tests
     tags:
@@ -1729,6 +1730,7 @@ tasks:
         vars:
           VERSION: '5.0'
           TOPOLOGY: server
+      - func: bootstrap kms servers
       - func: run custom snappy tests
   - name: run-bson-ext-test
     tags:
@@ -1741,6 +1743,7 @@ tasks:
         vars:
           VERSION: '5.0'
           TOPOLOGY: server
+      - func: bootstrap kms servers
       - func: run bson-ext test
         vars:
           NODE_LTS_NAME: erbium

.evergreen/generate_evergreen_tasks.js

@@ -637,6 +637,7 @@ const oneOffFuncAsTasks = oneOffFuncs.map(oneOffFunc => ({
         TOPOLOGY: 'server'
       }
     },
+    { func: 'bootstrap kms servers' },
     oneOffFunc
   ]
 }));