@Override
  public GetRegionLoadResponse getRegionLoad(RpcController controller, GetRegionLoadRequest request)
    throws ServiceException {
    GetRegionLoadResponse.Builder builder = GetRegionLoadResponse.newBuilder();
    return builder.build();
  }
Use this method to set what a scanner will reply as we next through
hbase-server/src/test/java/org/apache/hadoop/hbase/master/MockRegionServer.java