qa/666: rework kill logic for pmmgr
qa/666: rework kill logic for pmmgr

There are 2 processes in play here ... sudo and valgrind ... on
some platforms need to deal with both.

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