BaseLoadBalancer should consider region replicas when randomAssignment and roundRobinAssignment

Cluster cluster = createCluster(servers, regions, false);
List<RegionInfo> unassignedRegions = new ArrayList<>();
roundRobinAssignment(cluster, regions, unassignedRegions,
  servers, assignments);


  protected Cluster createCluster(List<ServerName> servers, Collection<RegionInfo> regions,
      boolean hasRegionReplica) {
    // Get the snapshot of the current assignments for the regions in question, and then create
    // a cluster out of it. Note that we might have replicas already assigned to some servers
    // earlier. So we want to get the snapshot to see those assignments, but this will only contain
    // replicas of the regions that are passed (for performance).
    Map<ServerName, List<RegionInfo>> clusterState = null;
    if (!hasRegionReplica) {
      clusterState = getRegionAssignmentsByServer(regions);
    } else {
      // for the case where we have region replica it is better we get the entire cluster's snapshot
      clusterState = getRegionAssignmentsByServer(null);
    }    for (ServerName server : servers) {
      if (!clusterState.containsKey(server)) {
        clusterState.put(server, EMPTY_REGION_LIST);
      }
    }
    return new Cluster(regions, clusterState, null, this.regionFinder,
        rackManager);
  }