private void cleanup() throws IOException {
    closeConnection();
    // unset the configuration for MIN and MAX RS to start
    conf.setInt(ServerManager.WAIT_ON_REGIONSERVERS_MINTOSTART, -1);
    conf.setInt(ServerManager.WAIT_ON_REGIONSERVERS_MAXTOSTART, -1);
  }
Abruptly Shutdown HBase mini cluster. Does not shutdown zk or dfs if running.
@throws java.io.IOException throws in case command is unsuccessful
hbase-server/src/test/java/org/apache/hadoop/hbase/HBaseTestingUtil.java