Dell PowerScale: Manage/Unmanage Snapshots support

manila manage snapshot lets you import an existing snapshot — one that already exists on the backend storage (created manually or outside Manila) — into Manila’s management database.

This is typically used when:

    You’ve restored or migrated a backend.

    You want Manila to track existing snapshots for quota or lifecycle management.

    You are previously unmanaged a snapshot and now want to re-manage it.