tests: show skip reason instead of "irrelevant" with unified tests, too
parsehghaveoutput expects just the test output, not the merged test/output,
so for skipped unified tests e.g.:
Skipped test-convert-darcs.t: missing feature: irrelevant
was shown instead of:
Skipped test-convert-darcs.t: missing feature: darcs client
[ original upstream description ]
(binary:application/octet-stream)