Update db in CGSnapshot create
Update db in CGSnapshot create

Model_update returned from the driver in cgsnapshot_create
is not used to update the db. This patch changes that.

Change-Id: I051da3b3a8f570c9dbd0893dfc93c8500a1c9cc8

phenoxim/cinder,Hybrid-Cloud/cinder,cloudbase/cinder,Nexenta/cinder,eharney/cinder,ge0rgi/cinder,openstack/cinder,openstack/cinder,bswartz/cinder,Hybrid-Cloud/cinder,eharney/cinder,dims/cinder,NetApp/cinder,Nexenta/cinder,mahak/cinder,phenoxim/cinder,j-griffith/cinder,NetApp/cinder,Datera/cinder,j-griffith/cinder,Datera/cinder,dims/cinder,cloudbase/cinder,bswartz/cinder,mahak/cinder