[Bug][Server] zookeeper multi directories, tasks cannot be assigned

Describe the bug zookeeper多级目录场景下任务无法分配worker

To Reproduce Steps to reproduce the behavior, for example:

1. 修改配置文件zookeeper.properties zookeeper.dolphinscheduler.root=/path/to/dolphinscheduler
2. 正常启动master, worker
3. 新建工作流定义, 新建shell节点, echo “hello world”

Expected behavior 1.控制台正常显示已注册的master, worker 2.启动任务后, master报错: “fail to execute : xxx due to no suitable worker, current task need to yyy worker group execute”

Which version of Dolphin Scheduler: -[1.3.1.release]

Additional context 1.ExecutorDispatcher#dispatch //hostManager.select 根据已经注册的worker, 通过group找到允许执行的worker 2.ZookeeperNodeManager$WorkerGroupNodeListener#dataChanged 监听worker变化 3.错误代码部分

`

    if (event.getType() == TreeCacheEvent.Type.NODE_ADDED) {
      logger.info("worker group node : {} added.", path);
      String group = parseGroup(path); //格式化获取group出错, 导致无法刷新syncWorkerGroupNodes
      Set<String> workerNodes = workerGroupNodes.getOrDefault(group, new HashSet<>());
      Set<String> previousNodes = new HashSet<>(workerNodes);
      Set<String> currentNodes = registryCenter.getWorkerGroupNodesDirectly(group);
      logger.info("currentNodes : {}", currentNodes);
      syncWorkerGroupNodes(group, currentNodes);
   }

`

`

private String parseGroup(String path){
String[] parts = path.split("\\/");
if(parts.length != 6){
  throw new IllegalArgumentException(String.format("worker group path : %s is not valid, ignore", path));
}
String group = parts[4]; // /dolphinscheduler/nodes/worker/default, 这段代码符合的路径
return group;

} `

1. 临时修改 String group = parts[parts.length-2];// 临时修改

5.问题原因: workerGroupNodes保存worker信息, workerGroupNodes通过dataChange刷新, parseGroup错误导致变量一直无法更新, 最终ExecutorDispatcher#dispatch无法获取worker, 任务无法继续

[XiaotaoYi]

I will take it.

[XiaotaoYi]

I will take it.

This is a bug, 1.3.2 immediately to release the version, do you have time to submit the code as soon as possible? If there is no time, we will fix this problem in 1.3.2. Thx

这算是一个bug，1.3.2着急要发版，你有时间尽快提交代码么，如果没有时间，我们将会在1.3.2上修复这个问题 . 如果有时间可以直接在1.3.2上提，谢谢

send a pr, but e2e Test fail. could you help take a look?