Support for specifying AZ when restore a shelved server

Registered by Brin Zhang

If the current instance is in the ``SHELVED_OFFLOADED`` status, the ``instances`` database table AZ is None, and the AZ of the instance recorded in the ``request_specs`` database table is the AZ of the original instance, this change comes from [1].

The purpose of this update is to specify AZ when unshelving the instance and update the AZ of the target instance in the ``request_specs`` and ``instances`` database tables to the AZ present in the system specified by the user.

[1] https://review.openstack.org/#/c/606086/

Blueprint information

Status:
Complete
Approver:
Matt Riedemann
Priority:
Low
Drafter:
Brin Zhang
Direction:
Approved
Assignee:
Brin Zhang
Definition:
Approved
Series goal:
Accepted for train
Implementation:
Implemented
Milestone target:
milestone icon train-3
Started by
Matt Riedemann
Completed by
Matt Riedemann

Related branches

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Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/support-specifying-az-when-restore-shelved-server,n,z

Addressed by: https://review.openstack.org/624689
    Specifying az when restore shelved server

Gerrit topic: https://review.openstack.org/#/q/topic:bp/support-specifying-az-when-restore-shelved-server

Gerrit topic: https://review.opendev.org/#/q/topic:bp/support-specifying-az-when-restore-shelved-server

Addressed by: https://review.opendev.org/624689
    Specifying az when restore shelved server

Addressed by: https://review.opendev.org/663851
    WIP:Specify availability_zone to unshelve

Approved for the Train release. -- mriedem 20190610

Gerrit topic: https://review.opendev.org/#/q/topic:bug/1723880

Addressed by: https://review.opendev.org/679164
    Follow up for specifying az to unshelve

This merged as microversion 2.77. -- mriedem 20190829

(?)

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