pre-upload: enforce some style on commit messages

Some commit message style checks can be automated, so start doing that
rather than forcing our reviewers to do it.

BUG=None
TEST=`./pre-upload_unittest.py` passes

Change-Id: Ic4e4a56b7cfd3576ce390fca36adfdf57e2069d4
Reviewed-on: https://chromium-review.googlesource.com/226682
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
2 files changed