fix license issue. Add license check pre-commit hooks.

[src-r-r]

I added a git pre-commit hook to check the license year to prevent further issues. Of course, I made the change of the license year as well. Verified by running the pre-commit hook as part of the commit process.

[nitzmahone]

IANAL, but Red Hat legal has basically told us to stop updating copyright dates on existing code, and to not add copyright dates at all in new code. I'm also not a fan of pre-commit hooks, so -1 from me, but I'll leave that one up to @ingydotnet to decide.