@Override
  public void waitForMasterToStop(ServerName serverName, long timeout) throws IOException {
    // ignore timeout for now
    waitOnMaster(getMasterIndex(serverName));
  }
Alternate shutdown hook. Just shuts down the passed fs, not all as default filesystem hook
does.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/MiniHBaseCluster.java