copy_volume_to_image with ceph use rbd export inefficiency

Bug #1881528 reported by HYSong
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Bug Description

It is inefficiency using 'rbd export' to save volume to local host when executing 'os-volume_upload_image' with ceph backend, and occupy large local resource.

Is it possible to use the way linuxrbd.RBDClient and RBDVolumeProxy in migrate_volume function?

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