ISSUE-13954: Flaky-test: PulsarSinkE2ETest.shutdown(org.apache.pulsar.io.PulsarSinkE2ETest)

[sijie]

Original Issue: apache/pulsar#13954

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PulsarSinkE2ETest is flaky. The shutdown(org.apache.pulsar.io.PulsarSinkE2ETest) test method fails sporadically.

https://github.com/apache/pulsar/runs/4942620767?check_suite_focus=true

Error:  shutdown(org.apache.pulsar.io.PulsarSinkE2ETest)  Time elapsed: 10.1 s  <<< FAILURE!
java.util.concurrent.CompletionException: org.apache.pulsar.metadata.api.MetadataStoreException$BadVersionException: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion for /loadbalance/brokers/localhost:34747
    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:331)
    at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:346)
    at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:777)
    at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:506)
    at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2088)
    at org.apache.pulsar.metadata.impl.ZKMetadataStore.handleDeleteResult(ZKMetadataStore.java:262)
    at org.apache.pulsar.metadata.impl.ZKMetadataStore.lambda$batchOperation$6(ZKMetadataStore.java:174)
    at org.apache.pulsar.metadata.impl.PulsarZooKeeperClient$3$1.processResult(PulsarZooKeeperClient.java:490)
    at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:722)
    at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:563)
Caused by: org.apache.pulsar.metadata.api.MetadataStoreException$BadVersionException: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion for /loadbalance/brokers/localhost:34747
    at org.apache.pulsar.metadata.impl.ZKMetadataStore.getException(ZKMetadataStore.java:420)
    ... 5 more
Caused by: org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode = BadVersion for /loadbalance/brokers/localhost:34747
    at org.apache.zookeeper.KeeperException.create(KeeperException.java:122)
    at org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
    at org.apache.pulsar.metadata.impl.ZKMetadataStore.getException(ZKMetadataStore.java:416)
    ... 5 more

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