protected void afterHandleReplicaMetadataResponse(RemoteReplicaGroup group) {
    // noop
  }
A callback method to invoke after calling handleReplicaMetadataResponse method for given RemoteReplicaGroup.
Subclass can override this method to put more control to each group.
@param group
ambry-replication/src/main/java/com/github/ambry/replication/ReplicaThread.java