Refactor mongodb classes

Change-Id: Iaadd59e59f5a73be5eb70930d88bdd0769816b2e
Related-PROD: PROD-19892
diff --git a/mongodb/server/single.yml b/mongodb/server/single.yml
index c3d6cca..8a08de0 100644
--- a/mongodb/server/single.yml
+++ b/mongodb/server/single.yml
@@ -2,4 +2,4 @@
 - service.mongodb.server.single
 parameters:
   _param:
-    mongodb_server_replica_set: ceilometer
+    mongodb_server_replica_set: stacklight