[scm-migration-dev] simplify tag check and fix backout check

[david.mar...@sun.com]

Author: dmarker <David.Marker at sun.com>
Repository: /hg/scm-migration/onnv-gk-tools
Latest revision: 8f918d2197a502b2a81801e69e77507d8318d41b
Total changesets: 1
Log message:
simplify tag check and fix backout check

Files:
        update: gate-closed-hgrc
        update: gate-hgrc
        update: hook/sanity.py
        update: lib/utility.py