Comment 2 for bug 1489876

Reviewed: https://review.openstack.org/227812
Committed: https://git.openstack.org/cgit/openstack/networking-bgpvpn/commit/?id=d985550e8b0a6dd906e1927c48c4c35ed6d00d80
Submitter: Jenkins
Branch: master

commit d985550e8b0a6dd906e1927c48c4c35ed6d00d80
Author: Thomas Morin <email address hidden>
Date: Fri Sep 25 14:06:01 2015 +0200

    Alembic migration update/cleanup

    This change updates and cleans up our alembic migration code:
    - we now use an alembic migration entry point, instead of shipping
      our own db management tool
    - use expand/contract alembic branches
    - downgrade is not supported anymore, drop it

    Change-Id: I8eb68075c720cd7252bd178c1bf08ef0947cd0d0
    Closes-Bug: 1489876