replace backbeat client with cloudserver client

Issue: BB-706

Author: SylvainSenechal

conf/config.json

@@ -34,13 +34,17 @@
             "host": "127.0.0.1",
             "port": 9990
         },
+
         "mongo": {
-            "replicaSetHosts":
-                "localhost:27017,localhost:27018,localhost:27019",
-            "writeConcern": "majority",
-            "replicaSet": "rs0",
-            "readPreference": "primary",
-            "database": "metadata"
+            "replicaSetHosts": "localhost:27017",
+                "authCredentials": {
+                    "password": "password",
+                    "username": "root"
+                },
+                "writeConcern": "majority",
+                "replicaSet": "rs0",
+                "readPreference": "primary",
+                "database": "metadata"
         },
         "kafka": {
             "topic": "backbeat-oplog",