migration between clouds during upgrade

Registered by Prashant

- When a new instance of openstack cloud is installed, and there is no rolling upgrade possible, and if it's still possible to connect to same storage end-points and same block storage pool, which was used in previous release, as the instance files exist on connected storage, should be possible to import those instances to new openstack cloud. (Similar to VMWare, where it's possible register VM browsing to storage inventory)
It could be done with some pre-conditions satisfied, viz if Tenant exists, or What tenant the VM should be registered to ?

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Prashant
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

Sprints

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

Addressed by: https://review.openstack.org/252809
    Attach/detach encryptors during swap_volume

Addressed by: https://review.openstack.org/604026
    WIP: Add nova database migration script(psql version)

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