Updates to script for 2-14-maintenance

These are the updates I should have pushed earlier, sorry @myronmarston, I
basically extracted the "should we run support" stuff into a function so that
2-14 could be added to the list of builds not to run it on.

I also added to the Rakefile because partly aborted updates werent cleaning up
after themselves so this deletes the branch or renames the branch as desired.