qa/870: additional diags
qa/870: additional diags

Turns out the real problem was in _get_pids_by_name() from pcp.env,
but these diags helped.

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