public void restartHBaseCluster(int servers, List<Integer> ports)
    throws IOException, InterruptedException {
    StartMiniClusterOption option =
      StartMiniClusterOption.builder().numRegionServers(servers).rsPorts(ports).build();
    restartHBaseCluster(option);
    invalidateConnection();
  }
Starts the hbase cluster up again after shutting it down previously in a test. Use this if you
want to keep dfs/zk up and just stop/start hbase.
@param servers number of region servers
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java