py3: port test-bugzilla.t to Python 3
Some assorted fixes required in the extension itself, all around
bytes/str issues.
Differential Revision: https://phab.mercurial-scm.org/D5680
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state