qa/583: rework pmcd&pmlogger stop/start
qa/583: rework pmcd&pmlogger stop/start

Use the explicit services pmcd and pmlogger, not the pseudo-service
pcp ... avoids failures on vm12 (Fedora 26).

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