public static void deleteChildrenRecursively(ZKWatcher zkw, String node) throws KeeperException {
    deleteChildrenRecursivelyMultiOrSequential(zkw, true, node);
  }
Delete all the children of the specified node but not the node itself. Sets no watches. Throws
all exceptions besides dealing with deletion of children.
@throws KeeperException if a ZooKeeper operation fails
hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java