2.x: fix periodic scheduling with negative period causing IAE #5419
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This PR adds unit tests to verify the
Scheduler.schedulePeriodicallyDirect
andScheduler.Worker.schedulePeriodically
works with non-positive period as required by the Javadoc.The
computation
andsingle
schedulers were not working properly and the underlyingScheduledExecutorService
crashed withIllegalArgumentException
thus these are now fixed with custom handler for theperiod <= 0L
cases.Related: #5416.