[ISSUE #5986] optimize the BrokerOuterAPITest class code

[hardyfish]

Make sure set the target branch to develop

What is the purpose of the change

close #5986

Brief changelog

optimize the BrokerOuterAPITest class code

Verifying this change

XXXX

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[codecov-commenter]

Codecov Report

Merging #5988 (9754988) into develop (5b64ffc) will increase coverage by 0.97%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #5988      +/-   ##
=============================================
+ Coverage      42.43%   43.40%   +0.97%     
- Complexity      8277     8825     +548     
=============================================
  Files           1066     1090      +24     
  Lines          73671    76611    +2940     
  Branches        9630    10003     +373     
=============================================
+ Hits           31261    33255    +1994     
- Misses         38460    39200     +740     
- Partials        3950     4156     +206     

Impacted Files	Coverage Δ
.../main/java/org/apache/rocketmq/common/UtilAll.java	35.91% <0.00%> (-0.62%)	⬇️
.../org/apache/rocketmq/store/ha/DefaultHAClient.java	58.46% <0.00%> (-3.08%)	⬇️
...a/org/apache/rocketmq/broker/BrokerController.java	43.25% <0.00%> (-2.90%)	⬇️
...pache/rocketmq/remoting/common/RemotingHelper.java	15.38% <0.00%> (-2.31%)	⬇️
...ache/rocketmq/store/queue/QueueOffsetAssigner.java	81.08% <0.00%> (-2.26%)	⬇️
...rocketmq/client/impl/factory/MQClientInstance.java	47.41% <0.00%> (-1.63%)	⬇️
...mq/client/impl/consumer/RebalanceLitePullImpl.java	69.86% <0.00%> (-1.37%)	⬇️
...c/main/java/org/apache/rocketmq/common/MixAll.java	41.44% <0.00%> (-1.29%)	⬇️
...apache/rocketmq/store/ha/GroupTransferService.java	92.30% <0.00%> (-1.29%)	⬇️
...q/controller/impl/manager/ReplicasInfoManager.java	61.07% <0.00%> (-0.89%)	⬇️
... and 72 more

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[Oliverwqcwrw]

@hardyfish , Thanks for your contribution :-)

[mxsm]

LGTM~