qa: do not leak pmlogger processes from qa/187, fix cleanup
qa: do not leak pmlogger processes from qa/187, fix cleanup

tjanez/pcp,adfernandes/pcp,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,wuliming/pcp,aeg-aeg/pcpfans,tjanez/pcp,tjanez/pcp,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,aeg-aeg/pcpfans,tjanez/pcp,wuliming/pcp,wuliming/pcp,edwardt/pcp,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,adfernandes/pcp,tjanez/pcp,wuliming/pcp,edwardt/pcp,aeg-aeg/pcpfans,adfernandes/pcp,edwardt/pcp,tjanez/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,edwardt/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans