Remove mongo keepalived, to resolve openstack telemetry conflict

Change-Id: I647dff4cc2f7a93a2f394577e846f789ce9c536a
diff --git a/mongodb/server/cluster.yml b/mongodb/server/cluster.yml
index 7053d87..f3c16d6 100644
--- a/mongodb/server/cluster.yml
+++ b/mongodb/server/cluster.yml
@@ -1,5 +1,4 @@
 classes:
-- service.keepalived.cluster.single
 - service.mongodb.server.cluster
 parameters:
   _param: