* Added a comment in MergeTableRegionsProcedure and SplitTableRegionProcedure explaining specific rollbacks has side effect that AssignProcedure/s are submitted asynchronously and those procedures may continue to execute even after rollback() is done.
* Updated comments in tests with correct rollback state to abort
* Added overloaded method MasterProcedureTestingUtility#testRollbackAndDoubleExecution which takes additional argument for waiting on all procedures to finish before asserting conditions
* Updated TestMergeTableRegionsProcedure#testRollbackAndDoubleExecution and TestSplitTableRegionProcedure#testRollbackAndDoubleExecution to use newly added method
Signed-off-by: Michael Stack <stack@apache.org>
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