docs: public static boolean isPartitionCleanupInProgress(ZooKeeper zk) throws KeeperException, InterruptedException
      {
          List<String> children = zk.getChildren(VoltZK.leaders_initiators, null);
          List<ZKUtil.ChildrenCallback> childrenCallbacks = Lists.newArrayList();
          for (String child : children) {
              ZKUtil.ChildrenCallback callback = new ZKUtil.ChildrenCallback();
              zk.getChildren(ZKUtil.joinZKPath(VoltZK.leaders_initiators, child), false, callback, null);
              childrenCallbacks.add(callback);
          }
  
          for (ZKUtil.ChildrenCallback callback : childrenCallbacks) {
              if (callback.get().isEmpty()) {
                  return true;
              }
          }
  
          return false;
      }