qa/common.check: try for more verbose diagnostics when _wait_for_pmcd fails
qa/common.check: try for more verbose diagnostics when _wait_for_pmcd fails

In CI, and for qa/244 in particular.

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