support for db downgrade

Registered by Hua Wang

Add support for db downgrade. It is necessary for rolling back when upgrade fails.

Blueprint information

Status:
Complete
Approver:
hongbin
Priority:
Undefined
Drafter:
Hua Wang
Direction:
Needs approval
Assignee:
Hua Wang
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
hongbin

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Whiteboard

@wanghua, I don't think this is the right direction. It is a cross-project decision to remove db downgrade https://review.openstack.org/#/c/152337/ .

(?)

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