BS-8109, rewrite test
BS-9960, exclude FlowNodeInstance randomly in ABORTING state
BS-9890, add more context on exception's description
BS-9990, Make unit test safe to parallel executions by different JVMs
BS-1542, removed duplicate in unit tests and improve unit test coverage
BS-9890, fix timer issue on postgresql
Merge branch '6.3.x' into 'MasterBugFixing'