kafka replication factor should depend on list of database nodes
kafka replication factor should depend on list of database nodes

Earlier zookeeper node list was same as database node list but it was changed
recently to be same as cfgm nodes. As a result, replication factor was getting
set wrongly if cfgm and database nodes are not same.
Closes-Bug: #1634397

Change-Id: Ib33dd446b18aee5174b7199d87a005bcaa533513

Juniper/contrail-provisioning,Juniper/contrail-provisioning