qa/518: fix parsing of pcp(1) output
qa/518: fix parsing of pcp(1) output

Was being confused when a primary pmie instance was running alongside
the QA pmie instance.

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