public static Configuration createClusterConf(Configuration baseConf, String clusterKey)
    throws IOException {
    return createClusterConf(baseConf, clusterKey, null);
  }
Generates a {@link Configuration} instance by applying the ZooKeeper cluster key to the base
Configuration. Note that additional configuration properties may be needed for a remote
cluster, so it is preferable to use {@link #createClusterConf(Configuration, String, String)}.
@param baseConf   the base configuration to use, containing prefixed override properties
@param clusterKey the ZooKeeper quorum cluster key to apply, or {@code null} if none
@return the merged configuration with override properties and cluster key applied
@see #createClusterConf(Configuration, String, String)
hbase-common/src/main/java/org/apache/hadoop/hbase/HBaseConfiguration.java