Directly download and upload images to RBD

Registered by Daniel Speichert on 2019-05-13

When configured with Ceph RBD backend access, nova will be able to pull Glance
images stored in Ceph directly from Ceph instead of streaming the payload
over the Glance HTTP API. Similarly, the upload of instance snapshot will
happen directly to Ceph and the snapshot will be registered in Glance with
a location URL pointing to Ceph instead of a payload upload over HTTP API.

Blueprint information

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

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Gerrit topic: https://review.opendev.org/#/q/topic:bp/image-rbd-download-upload

Addressed by: https://review.opendev.org/658903
    Directly download and upload images to RBD

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