public static String getZooKeeperClusterKey(Configuration conf) {
    return getZooKeeperClusterKey(conf, null);
  }
Get the key to the ZK ensemble for this configuration without adding a name at the end
@param conf Configuration to use to build the key
@return ensemble key without a name
hbase-common/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKConfig.java