Module `gettextutils` from common code was graduated to oslo.i18n, so it would be great if we reuse this library. Change-Id: Ie5836b82723fc80c1d54e5e65eac8565cf905c5a
This module could be used either for: 1. Smooth transition from migrate tool to alembic 2. As standalone alembic tool
Core points: 1. Upgrade/downgrade database with usage of alembic/migrate migrations or both 2. Compatibility with oslo.config 3. The way to autogenerate new revisions or stamps