Update automate-git.py to explicitly fetch tags required for release branch builds.
Update automate-git.py to explicitly fetch tags required for release branch builds.

git-svn-id: 66addb63d0c46e75f185859367c4faf62af16cdd@1791 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

kuscsik/chromiumembedded,kuscsik/chromiumembedded,kuscsik/chromiumembedded,kuscsik/chromiumembedded