RBD driver: upload raw format volume to glance by cloning

Registered by chengsheng

When using ceph, to create a image from a volume, the volume will be downloaded to a local temporary directory, and then uploaded to glance after conversion.

However, if you create a raw format image, you only need to upload it to glance through clone.

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Priority:
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Drafter:
chengsheng
Direction:
Needs approval
Assignee:
chengsheng
Definition:
New
Series goal:
Accepted for yoga
Implementation:
Unknown
Milestone target:
None

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