Updated openstack/openstack
Project: openstack/cinder  64c6eea42a3df46dd7f3d171f8f5d8de06e4692c
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Nexenta iSCSI driver: Refactor create_cloned_volume

Optimize volume cloning of Nexenta iSCSI driver, current implementation
with zfs send recv may take long time, because it requires data
transferring.

Change-Id: Iaa2eea608e09d0a4ac155b74f964b153de561f4c