[ISSUE #3229] check running status when schedule new DeliveryMessageTimerTask.

[lifepuzzlefun]

when ScheduleMessageService stoped. the timer canceled. and new schedule task will cause exception. then show "ScheduleMessageService, messageTimeup execute error, drop it. msgExt" in log.

[coveralls]

Coverage increased (+0.1%) to 54.231% when pulling 3dd37caf40e96420a8c695c5f82716d1231992e2 on WJL3333:fix_schedule_task_drop_message into 44bdeedad2d0e28717f5012d375d12af76305bb5 on apache:develop.

[codecov-commenter]

Codecov Report

Merging #3230 (3dd37ca) into develop (44bdeed) will increase coverage by 0.05%. The diff coverage is 55.55%.

@@              Coverage Diff              @@
##             develop    #3230      +/-   ##
=============================================
+ Coverage      47.95%   48.00%   +0.05%     
- Complexity      4565     4568       +3     
=============================================
  Files            552      552              
  Lines          36521    36525       +4     
  Branches        4818     4819       +1     
=============================================
+ Hits           17514    17535      +21     
+ Misses         16795    16768      -27     
- Partials        2212     2222      +10     

Impacted Files	Coverage Δ
...ocketmq/store/schedule/ScheduleMessageService.java	73.76% <55.55%> (-0.49%)	:arrow_down:
...org/apache/rocketmq/store/ha/WaitNotifyObject.java	66.07% <0.00%> (-5.36%)	:arrow_down:
...a/org/apache/rocketmq/filter/util/BloomFilter.java	59.13% <0.00%> (-2.16%)	:arrow_down:
...he/rocketmq/client/trace/AsyncTraceDispatcher.java	77.72% <0.00%> (-1.49%)	:arrow_down:
...ketmq/common/protocol/body/RegisterBrokerBody.java	83.69% <0.00%> (-1.09%)	:arrow_down:
...n/java/org/apache/rocketmq/store/ha/HAService.java	71.28% <0.00%> (-0.67%)	:arrow_down:
...he/rocketmq/remoting/protocol/RemotingCommand.java	78.22% <0.00%> (-0.41%)	:arrow_down:
...mq/client/impl/producer/DefaultMQProducerImpl.java	44.86% <0.00%> (-0.37%)	:arrow_down:
...main/java/org/apache/rocketmq/store/CommitLog.java	73.53% <0.00%> (-0.12%)	:arrow_down:
...ava/org/apache/rocketmq/filter/util/BitsArray.java	59.82% <0.00%> (ø)
... and 7 more

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[ltamber]

+1

[Git-Yang]

Can you resolve the conflict？

[ShannonDing]

file conflicted now, it is better to resolve it first.