Lots of zookeeper cleanup error when dubbo shutdown

- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 3.0.3-SNAPSHOT
* Operating System version: macOS
* Java version: 1.8

### Steps to reproduce this issue

1. Run test org.apache.dubbo.config.spring.reference.javaconfig.JavaConfigReferenceBeanTest#testReferenceBean

### Actual Result

What actually happens?

Lots of zookeeper cleanup error when dubbo shutdown, and shutdown is slowdown:

```
16:47:25.897 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Socket error occurred: localhost/127.0.0.1:2181: Connection refused
16:47:25.898 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxnSocketNIO - Ignoring exception during shutdown input
java.nio.channels.ClosedChannelException: null
at sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:780)
at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:399)
at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:200)
at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1250)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1174)
16:47:25.898 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxnSocketNIO - Ignoring exception during shutdown output
java.nio.channels.ClosedChannelException: null
at sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:797)
at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:407)
at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:207)
at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1250)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1174)
16:47:25.979 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
16:47:25.979 [main-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Socket error occurred: localhost/127.0.0.1:2181: Connection refused
16:47:25.979 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxnSocketNIO - Ignoring exception during shutdown input
java.nio.channels.ClosedChannelException: null
at sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:780)
at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:399)
at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:200)
at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1250)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1174)
16:47:25.979 [main-SendThread(localhost:2181)] DEBUG org.apache.zookeeper.ClientCnxnSocketNIO - Ignoring exception during shutdown output
java.nio.channels.ClosedChannelException: null
at sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:797)
at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:407)
at org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:207)
at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1250)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1174)

```
[dubbo-8711-error.txt](https://github.com/apache/dubbo/files/7120299/dubbo-8711-error.txt)