Check if already managed before manage snapshot

[huanan]

Currently there is no mechanism to check whether the backend snapshot is already managed by Cinder before doing the import. We can just import the same backend snapshot to Cinder for many times and leave many snapshots in Cinder but they are referring to exactly the same backend snapsho. If we delete one of the snapshots,there is no mechanism to check whether the backend snapshot is referred by other snapshots just delete it. This BP trying to solve these problems.

[Sheel Rana (ranasheel2000)]

Dear huanan,

No activity visible on this bug since last 5-6 months.
So, we want to take this ahead..

Please let us know in case of any concerns!!

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/314923

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sean McGinnis (<email address hidden>) on branch: master
Review: https://review.openstack.org/314923
Reason: This review is > 4 weeks without comment and currently blocked by a core reviewer with a -2. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and contacting the reviewer with the -2 on this review to ensure you address their concerns.

[Jay Bryant (jsbryant)]

Moving this back to triaged. No one has been working on this and it could probably be looked at by someone else.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/527957