git hook scripts for various purposes

commit-msg.ver

Adds a version line based on a file named 'version.py' to each git commit message if not already present.

commit-msg.chgid

Adds a gerrit-friendly Change-Id line to each commit message if not already present.

commit-msg.vc

Adds both gerrit-friendly Change-Id and Version line to each commit message if not already present.

pre-commit.ver

Checks 1) that version.py has been incremented since last commit and 2) that version.py is staged for the upcoming commit.