Do not accept enterprise licenses in some cases.

This commit makes it so that enterprise licenses are rejected in HA
environments if there is no active MongoDB server.

Additionally, it suppresses trying to connect to MongoDB in cases where
it is not present or meaningful.

awx/fact/__init__.py

@@ -14,7 +14,19 @@ logger = logging.getLogger('awx.fact')
 
 # Connect to Mongo
 try:
-    connect(settings.MONGO_DB, tz_aware=settings.USE_TZ)
+    # Sanity check: If we have intentionally invalid settings, then we
+    # know we cannot connect.
+    if settings.MONGO_HOST == NotImplemented:
+        raise ConnectionError
+
+    # Attempt to connect to the MongoDB database.
+    connect(settings.MONGO_DB,
+        host=settings.MONGO_HOST,
+        port=int(settings.MONGO_PORT),
+        username=settings.MONGO_USERNAME,
+        password=settings.MONGO_PASSWORD,
+        tz_aware=settings.USE_TZ,
+    )
     register_key_transform(get_db())
 except ConnectionError:
     logger.warn('Failed to establish connect to MongoDB "%s"' % (settings.MONGO_DB))