Scheduler hangs when Focus does not signal Autofocus start failure

Issue reported on forum: https://www.indilib.org/forum/ekos/14075-scheduler-hangs-on-focusing-of-next-job.html#97327

Focus fails to signal Autofocus failure if it finds AdjustFocus running. This results in the Scheduler hanging.

Tries 3 times with 10sec interval (in the expectation that AdjustFocus will have completed). If not, focus signals Autofocus Abort.