DeterministicScheduler repeats failed and cancelled tasks

[tKe]

The javadoc for ScheduledExecutorService states the following:

If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor.

Currently DeterministicScheduler will always resubmit the task to the deltaQueue if it's a repeating task, regardless of whether the task is cancelled or has encountered an exception.