feat(client): add timer to clean off line broker and test case.

[ShannonDing]

What is the purpose of the change

feat(client): add timer to clean off line broker and test case.

Brief changelog

feat(client): add timer to clean off line broker and test case.

[codecov-io]

Codecov Report

Merging #222 into master will increase coverage by 2.28%.
The diff coverage is 72.42%.

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
+ Coverage   45.53%   47.82%   +2.28%     
==========================================
  Files         171      173       +2     
  Lines       10243    10441     +198     
==========================================
+ Hits         4664     4993     +329     
+ Misses       5579     5448     -131

Impacted Files	Coverage Δ
src/MQClientManager.cpp	100% <ø> (ø)	⬆️
src/MQClientAPIImpl.cpp	16.14% <0%> (+13.39%)	⬆️
src/MQClientFactory.cpp	18.45% <10.34%> (+12%)	⬆️
test/src/MQClientFactoryTest.cpp	100% <100%> (ø)
test/src/MQClientAPIImpTest.cpp	98.11% <98.11%> (ø)
src/common/MQClient.cpp	38.61% <0%> (-0.39%)	⬇️
src/producer/DefaultMQProducer.cpp	5.47% <0%> (-0.02%)	⬇️
src/consumer/OffsetStore.cpp	0% <0%> (ø)	⬆️
... and 6 more

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