Use mongodb_conn_validator instead of anchor.

Anchor['mongodb setup done'] has been removed since the equivalent
is already done in the module itself. Hence we rely on this resource
to make sure MongoDB is up and running.

Change-Id: I800d61f7423db4b9a12c75fe1788546c8fcf12ed

manifests/telemetry/collector.pp

@@ -46,7 +46,7 @@ class cloud::telemetry::collector(
   class { 'ceilometer::db':
     database_connection => $db_conn,
     sync_db             => true,
-    require             => Anchor['mongodb setup done'],
+    require             => Mongodb_conn_validator['mongodb'],
   }
   class { 'ceilometer::collector': }