qa/check: rework callback aborted logic
qa/check: rework callback aborted logic

Reinstate the Aborted! message that pcp-daily is looking for
when check.callback returns with non-zero status (which abandons
the rest of the QA run).

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