When exiting, let's explicitly wait for our worker processes to finish first. That's useful if unmounting of /home/ is scheduled to happen right after homed is down, as we then can be sure that the home directories are properly unmounted and detached by the time homed is fully terminated (otherwise it might happen that our worker gets killed by the service manager, thus leaving the home directory and its backing devices up/left for auto-clean which might be async). Likely fixes #16842
System and Service Manager
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