cloudbyte driver create_cloned_volume doesn't use src_vref for id

[Walt Boring]

The cloudbyte driver's create_cloned_volume uses volume['source_volid'] to get the parent volume's id. The source volume is passed in, and the id is in there.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/219531

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/219531
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=c1632465e8b240a38d1774649cdbf1d8d90da165
Submitter: Jenkins
Branch: master

commit c1632465e8b240a38d1774649cdbf1d8d90da165
Author: Walter A. Boring IV <email address hidden>
Date: Wed Sep 2 02:10:43 2015 +0000

    Cloudbyte fix create_cloned_volume parent id

    The CloudByte driver is reading the parent's volume id from the
    new volume's source_volid. There are some cases when this isn't set.
    The source volume object/dict is passed in, so just access the id
    from there.

    Change-Id: If6d3f50d11e36434e194a355e874d44f9d79f553
    Closes-Bug: 1491206