Implement Volume Backup Creation via TaskFlow

Registered by Mikhail Khodos

Implementing long-running operations via task flows is needed, so we can better control the operation process. Task flows will evetually allow us to pause/resume running backups, reverting in case of failure and tracking progress of running tasks.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Mikhail Khodos
Direction:
Needs approval
Assignee:
Mikhail Khodos
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.

Motivation:
All long-running processes will eventually end up implemented as task flows.
Volume backups, for example, is such a potentially long-running process.
So creation of (and then restoration from) a volume backup should be implemented via
a task flow.
After the mechanism for task progress update is there (see https://blueprints.launchpad.net/taskflow/+spec/task-progress) such mechanism should be used by vendor's drivers to update backup/restore task progress.

Gerrit topic: https://review.openstack.org/#q,topic:bp/volume-backup-create-task-flow,n,z

Addressed by: https://review.openstack.org/53480
    Implements volume backups via task flow

Addressed by: https://review.openstack.org/64469
    Implements volume backups via task flow

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