py3: decode bytes before logging in run-tests.py
Avoids messages like "Found prerequisite b'diff' at b'/usr/bin/diff'"
under Python 3.
Set up $ hg init repo $ cd repoTry to import an empty patch $ hg import --no-commit - <<EOF > EOF applying patch from stdin abort: stdin: no diffs found [255]No dirstate backups are left behind $ ls .hg/dirstate* | sort .hg/dirstate