[ISSUE #4821] Add some integration tests for POP consumption in slave-acting-master mode

[caigy]

Make sure set the target branch to develop

What is the purpose of the change

fix #4821

Brief changelog

Add PopSlaveActingMasterIT and fix some bugs found.

Verifying this change

XXXX

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[ShannonDing]

org.apache.rocketmq.broker.processor.ChangeInvisibleTimeProcessorTest
testProcessRequest_Success(org.apache.rocketmq.broker.processor.ChangeInvisibleTimeProcessorTest) Time elapsed: 2.568 sec <<< ERROR!
java.lang.NullPointerException
at org.apache.rocketmq.broker.processor.ChangeInvisibleTimeProcessorTest.testProcessRequest_Success(ChangeInvisibleTimeProcessorTest.java:122)

[coveralls]

Coverage decreased (-0.1%) to 49.076% when pulling cad0ada on caigy:issue-4821 into 8dd07c8 on apache:develop.

[codecov-commenter]

Codecov Report

Merging #4822 (22dd251) into develop (8dd07c8) will decrease coverage by 0.11%.
The diff coverage is 40.00%.

❗ Current head 22dd251 differs from pull request most recent head cad0ada. Consider uploading reports for the commit cad0ada to get more accurate results

@@              Coverage Diff              @@
##             develop    #4822      +/-   ##
=============================================
- Coverage      44.94%   44.82%   -0.12%     
  Complexity      7640     7640              
=============================================
  Files            980      982       +2     
  Lines          68135    68239     +104     
  Branches        9014     9025      +11     
=============================================
- Hits           30622    30591      -31     
- Misses         33729    33847     +118     
- Partials        3784     3801      +17     

Impacted Files	Coverage Δ
...cketmq/broker/processor/PopBufferMergeService.java	37.67% <0.00%> (-3.04%)	⬇️
...he/rocketmq/broker/processor/PopReviveService.java	38.35% <0.00%> (ø)
...broker/processor/ChangeInvisibleTimeProcessor.java	66.97% <100.00%> (+1.83%)	⬆️
...rocketmq/broker/processor/PopMessageProcessor.java	38.17% <100.00%> (-0.57%)	⬇️
...va/org/apache/rocketmq/store/FlushDiskWatcher.java	81.25% <0.00%> (-9.38%)	⬇️
...controller/impl/DefaultBrokerHeartbeatManager.java	71.26% <0.00%> (-9.23%)	⬇️
...q/namesrv/routeinfo/BrokerHousekeepingService.java	72.72% <0.00%> (-9.10%)	⬇️
...a/org/apache/rocketmq/logging/inner/SysLogger.java	28.57% <0.00%> (-5.72%)	⬇️
...etmq/namesrv/routeinfo/BatchUnRegisterService.java	94.73% <0.00%> (-5.27%)	⬇️
...java/org/apache/rocketmq/logging/inner/Logger.java	51.67% <0.00%> (-4.31%)	⬇️
... and 39 more

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