Error message in update_migrated_volume was incorrect
Error message in update_migrated_volume was incorrect

If an error was encountered in self.vg.rename_volume the error
message tried to use volume['name'], which is an invalid key.
The invalid key error would then cause the retype/migration to
abort in the middle of the process and leave original and temporary
volume in place. This patch fixes this bug by providing a valid key.

Change-Id: I73e1335c649df41d5167efc3cb4b9af48a5d537d
Closes-bug: #1492462

Nexenta/cinder,duhzecca/cinder,scality/cinder,ge0rgi/cinder,mahak/cinder,nikesh-mahalka/cinder,NetApp/cinder,j-griffith/cinder,scality/cinder,nikesh-mahalka/cinder,duhzecca/cinder,winndows/cinder,Datera/cinder,scottdangelo/RemoveVolumeMangerLocks,NetApp/cinder,Hybrid-Cloud/cinder,cloudbase/cinder,phenoxim/cinder,mahak/cinder,Nexenta/cinder,takeshineshiro/cinder,cloudbase/cinder,bswartz/cinder,Paul-Ezell/cinder-1,Paul-Ezell/cinder-1,scottdangelo/RemoveVolumeMangerLocks,dims/cinder,Datera/cinder,openstack/cinder,bswartz/cinder,sasukeh/cinder,j-griffith/cinder,eharney/cinder,apporc/cinder,takeshineshiro/cinder,winndows/cinder,dims/cinder,phenoxim/cinder,apporc/cinder,openstack/cinder,Hybrid-Cloud/cinder,sasukeh/cinder,eharney/cinder