Revert "qa/common.check: changes in _service for systemctl and pmie"
Revert "qa/common.check: changes in _service for systemctl and pmie"

This reverts commit e97791dcad00f271618fbc26744428913a2a5fa8.

This change to _service() in common.check is redundant now that
pmie_check.service and pmie_check.timer are PartOf pmie.service,
(see 7fdcb968b890). We want to exercise the systemd config change
during QA on systemd platforms (qa/575 is a relevant test).

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