qa/864: rework notrun guard
qa/864: rework notrun guard

pcp collectl --version does not return exit status 2 ... it has an exit
status of 1 independent of whether pcp-collectl is installed or not.
So grep the output from pcp collectl --version to decide if you can
run this one or not.

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