tests: work around FreeBSD's unzip having slightly different output
According to man 1 unzip, this unzip appeared in FreeBSD 8.0. It's
what comes as /usr/bin/unzip, so we may as well cater to it since it's
easy.
contrib: fix check-commit to not reject commits from `hg sign` and `hg tag`
I'm tired of having a spurious red build every time we do a
release. Fix it once and for all.
Added signature for changeset
a1dd2c0c479e