ISSUE-17530: Flaky-test: AdminApi2Test.cleanup

[sijie]

Original Issue: apache#17530

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Example failure

https://github.com/apache/pulsar/runs/8238194308?check_suite_focus=true

Exception stacktrace

  Error:  Tests run: 80, Failures: 1, Errors: 0, Skipped: 12, Time elapsed: 787.544 s <<< FAILURE! - in org.apache.pulsar.broker.admin.AdminApi2Test
  Error:  cleanup(org.apache.pulsar.broker.admin.AdminApi2Test)  Time elapsed: 12.167 s  <<< FAILURE!
  java.util.concurrent.CompletionException: org.apache.pulsar.metadata.api.MetadataStoreException$NotFoundException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /loadbalance/leader
  	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:332)
  	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:347)
  	at java.base/java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:781)
  	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
  	at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2162)
  	at org.apache.pulsar.metadata.impl.ZKMetadataStore.handleDeleteResult(ZKMetadataStore.java:279)
  	at org.apache.pulsar.metadata.impl.ZKMetadataStore.lambda$batchOperation$6(ZKMetadataStore.java:191)
  	at org.apache.zookeeper.MockZooKeeper.multi(MockZooKeeper.java:1009)
  	at org.apache.pulsar.metadata.impl.ZKMetadataStore.batchOperation(ZKMetadataStore.java:165)
  	at org.apache.pulsar.metadata.impl.batching.AbstractBatchedMetadataStore.flush(AbstractBatchedMetadataStore.java:117)
  	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
  	at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
  	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
  	at java.base/java.lang.Thread.run(Thread.java:833)
  Caused by: org.apache.pulsar.metadata.api.MetadataStoreException$NotFoundException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /loadbalance/leader
  	at org.apache.pulsar.metadata.impl.ZKMetadataStore.getException(ZKMetadataStore.java:445)
  	... 12 more
  Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /loadbalance/leader
  	at org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
  	at org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
  	at org.apache.pulsar.metadata.impl.ZKMetadataStore.getException(ZKMetadataStore.java:439)
  	... 12 more

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• I'm willing to submit a PR!