Comment 1 for bug 1670409

Reviewed: https://review.openstack.org/440875
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=15817166ab35212069517ba0002d8098988fd3bd
Submitter: Jenkins
Branch: master

commit 15817166ab35212069517ba0002d8098988fd3bd
Author: Alexander Bashmakov <email address hidden>
Date: Thu Mar 2 23:40:16 2017 +0000

    Fix experimental E-M-C migrations

    Two closely related issues were discovered in the code which prevent
    the experimental E-M-C (rolling upgrade) migration feature introduced
    in Ocata from working: a malformed select statement in the ocata
    community images data migration (missing function parentheses)
    and an incorrect revision dependency in the DB migration (should be
    'ocata_expand01' instead of 'expand'. Also added a test for the case
    where the Glance database is new/empty which illuminated this bug.

    Closes-Bug: 1670409
    Change-Id: I40ffaaa3fa2bae7a555a86d9f31422d79fb9bb19