@Override
      public void println(String x) {
        super.print(x);
        super.print(", ");
      }
@param baseDir             the base directory to use
@param numZooKeeperServers the number of ZooKeeper servers
@return ClientPort server bound to, -1 if there was a binding problem and we couldn't pick
        another port.
@throws IOException          if an operation fails during the startup
@throws InterruptedException if the startup fails
hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/MiniZooKeeperCluster.java