public RegionServerServices createMockRegionServerService(RpcServerInterface rpc)
    throws IOException {
    final MockRegionServerServices rss = new MockRegionServerServices(getZooKeeperWatcher());
    rss.setFileSystem(getTestFileSystem());
    rss.setRpcServer(rpc);
    return rss;
  }
Create a stubbed out RegionServerService, mainly for getting FS. This version is used by
TestTokenAuthentication
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java