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Added RBD direct image download scheme for Nova #53

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@angapov angapov commented Oct 3, 2015

Added RBD direct image download scheme for Nova

Inspired by https://review.openstack.org/37817

Added new rbd download scheme for Nova. With that change
Nova can download RBD images directly from Ceph using 'rbd export'
command not involving rather slow download by HTTP from Glance
server. That makes image download process much faster if local
disks storage is configured for Nova.

Option must be set in nova.conf:
allowed_direct_url_schemes = rbd
Also Nova must have read access to images pool in Ceph.

Change-Id: I9c3b45d7e0aeadbe5aa49f5339cf27ee262e51ae

Change-Id: I9c3b45d7e0aeadbe5aa49f5339cf27ee262e51ae
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