ScheduledExecutorService.scheduleAtFixedRate tends to run enormous
amounts of runnables that would have been scheduled during a machine is
in sleep, after the machines wakes up from sleep, retroactively.
This is not good and can be avoided by using scheduleWithFixedDelay
which is usually good enough regarding the delay between executions.
gitlab #531
Change-Id: I4ac3b11f1f9236d411debb352fce610c33410659