Add support for running upgrade checkers

Registered by Mark Goddard on 2019-03-29

A cross-project goal for Stein, many projects have added support for
upgrade checks.

We should run the checks during the upgrade command, and also add a new upgrade-check command to run only the checks.

Upgrade checkers topic in Gerrit:
https://review.openstack.org/#/q/topic:upgrade-checkers

Blueprint information

Status:
Started
Approver:
None
Priority:
Medium
Drafter:
Mark Goddard
Direction:
Needs approval
Assignee:
Mark Goddard
Definition:
New
Series goal:
Accepted for victoria
Implementation:
Started
Milestone target:
None
Started by
Mark Goddard on 2019-10-21

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/upgrade-checkers,n,z

Addressed by: https://review.openstack.org/644528
    WIP: Add initial support for upgrade checkers

(?)

Work Items

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