COMPASS-824 backport COMPASS-742 allowDiskUse (#807)

this will allow 1.6 versions to connect to atlas free tier instances.

Author: rueckstiess

package.json

@@ -148,7 +148,7 @@
     "mongodb": "^2.2.8",
     "mongodb-collection-model": "^0.3.1",
     "mongodb-connection-model": "^6.3.5",
-    "mongodb-data-service": "^2.5.1",
+    "mongodb-data-service": "^2.12.2",
     "mongodb-database-model": "^0.1.2",
     "mongodb-explain-plan-model": "^0.2.2",
     "mongodb-extended-json": "^1.9.0",