HBaseAdmin may leak ZooKeeper connections

When master crashs, HBaseAdmin will leaks ZooKeeper connections
I think we should close the zk connetion when throw MasterNotRunningException

public HBaseAdmin(Configuration c)
throws MasterNotRunningException, ZooKeeperConnectionException {
this.conf = HBaseConfiguration.create(c);
this.connection = HConnectionManager.getConnection(this.conf);
this.pause = this.conf.getLong("hbase.client.pause", 1000);
this.numRetries = this.conf.getInt("hbase.client.retries.number", 10);
this.retryLongerMultiplier = this.conf.getInt("hbase.client.retries.longer.multiplier", 10);

//we should add this code and close the zk connection
try

{ this.connection.getMaster(); }

catch(MasterNotRunningException e)

{ HConnectionManager.deleteConnection(conf, false); throw e; }

}