Add direct upload feature for rbd glance backend

Registered by dan kim

This blueprint aims to support specifying the direct upload feature for "rbd glance backend" when nova snapshot.

[Background]
Supporting for direct upload of downloads locations is already added by plug-in modules.
(https://review.openstack.org/37817)

And this feature only can support file not rbd images.
Added new rbd upload scheme for Nova. With that change
Nova can upload images directly to rbd glance backend (like Ceph)
not involving rather slow upload by HTTP to Glance server.

[Benefit for the user]
That makes image upload process much faster if local
disks storage is configured for Nova.

[Usage]
Option must be set in nova.conf:
allowed_direct_url_schemes = rbd

Blueprint information

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

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