@Override
  public GetRegionInfoResponse getRegionInfo(RpcController controller, GetRegionInfoRequest request)
    throws ServiceException {
    GetRegionInfoResponse.Builder builder = GetRegionInfoResponse.newBuilder();
    builder.setRegionInfo(ProtobufUtil.toRegionInfo(RegionInfoBuilder.FIRST_META_REGIONINFO));
    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