This changes:
$ cinder rename asdf
ERROR: Must supply either name or description. (HTTP 1)
To:
$ cinder rename asdf
ERROR: Must supply either name or description.
Affects rename, snapshot-rename, consisgroup-update,
and consisgroup-create-from-src.
(consisgroup-* previously printed HTTP 400.)
Closes-Bug: #1549020
Closes-Bug: #1549026
Change-Id: Ia920b3b75b53170789b694cbdd49100bd6a72d21