replace src/* git scripts with a single src/gits

I keep re-using this functionality in completely unrelated realms, and decided
to unify the oddly named scripts in a single 'gits' meta-repos tool, so I can
just symlink this script into my ~/bin and use it everywhere.

Change-Id: I579e7af26d76d5c5d83b2349695456bc7b54f5a2
7 files changed