Remove DB downgrade

Registered by wangxiyuan

As downgrade are not supported after Kilo, we should remove them now.

The openstack-spce has explained in detail:
http://specs.openstack.org/openstack/openstack-specs/specs/no-downward-sql-migration.html

and after that, roll backs can be performed as mentioned in the below link:
http://docs.openstack.org/openstack-ops/content/ops_upgrades-roll-back.html

Blueprint information

Status:
Complete
Approver:
Nikhil Komawar
Priority:
Medium
Drafter:
wangxiyuan
Direction:
Approved
Assignee:
wangxiyuan
Definition:
Approved
Series goal:
Accepted for newton
Implementation:
Implemented
Milestone target:
milestone icon newton-1
Started by
Nikhil Komawar
Completed by
wangxiyuan

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Gerrit topic: https://review.openstack.org/#q,topic:bug/1501233,n,z

Addressed by: https://review.openstack.org/229220
    Remove DB downgrade

Addressed by: https://review.openstack.org/240451
    Add a deprecation warning to the DB downgrade

Gerrit topic: https://review.openstack.org/#q,topic:bp/remove-db-downgrade,n,z

[2016-05-09 nikhil] there's a lite spec for adding a deprecation warning proposed here https://bugs.launchpad.net/glance/+bug/1501233 . Linking the same as related bug to this BP. So the overall effect is that we deprecated this in Mitaka and are removing it in Newton.

The original proposal was in incorrect place so we needed a patch to fix that https://review.openstack.org/#/c/314204/ . The update job for docs is broken but the docs seem to be published correctly here: http://docs-draft.openstack.org/04/314204/1/check/gate-glance-specs-docs/a5a227b//doc/build/html/specs/newton/approved/index.html

(?)

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