qa/651: run pmproxy as user pcp if possible, additional diagnostics
qa/651: run pmproxy as user pcp if possible, additional diagnostics

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