qa/common.check: _remove_job_scheduler needs to save pmie.service in systemd_state
qa/common.check: _remove_job_scheduler needs to save pmie.service in systemd_state

Now the pmie_{check,daily} timers are PartOf pmie.service,
_remove_job_scheduler() needs to also stash the is-active
status of pmie.service in systemd_state. Otherwise, after
_remove_job_scheduler stops the timers (and pmie.service),
pmie.service will not be restarted by _restore_job_scheduler.
(qa/255,510 and 920 affected by this were leaving pmie.service
enabled but stopped).

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp