Tracking issue for flaky tests #313
Description
This is a tracking issue for unstable tests, and each unstable test is linked as a subtask.
- unstable unit test in TestWorkerInitAndClose #312
- unstable unit test of TestDMJobmasterSuite/TestClearWorkerStatus #314
- unstable unit test of TestEtcdElectionCampaign #315
- unstable unit test TestLeaderLoopWatchLeader #319
- unstable unit test TestDiscoveryRunner #331
- Unit test TestWorkerMasterFailover is not stable #353