Add ability for failed RBD restore to be rolled back

Registered by Edward Hope-Morley

Currently, if we restore to an existing volume, if the restore operation fails the volume will likely be left unusable. RBD supports the ability to 'rollback' to a snapshot (http://ceph.com/docs/next/rbd/librbdpy/#rbd.Image.rollback_to_snap) so we should add support for this to the cinder ceph backup driver.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Edward Hope-Morley
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Sean McGinnis

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(smcginnis): Marking obsolete as this has been sitting out there for a long time. If this is still needed, please submit a new bp.

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