Add clusterMonitor role to MongoDB user creation

Author: anoppe

readme-vars.yml

@@ -77,6 +77,7 @@ app_setup_block: |
     user: "${MONGO_USER}",
     pwd: "${MONGO_PASS}",
     roles: [
+      "clusterMonitor",
       { db: "${MONGO_DBNAME}", role: "dbOwner" },
       { db: "${MONGO_DBNAME}_stat", role: "dbOwner" },
       { db: "${MONGO_DBNAME}_audit", role: "dbOwner" },