Comment 4 for bug 1863729

Martin, I think the necessary "cluster_name" property of a volume wasn't exposed in previous versions of the API, but it might be now and we might able to reprise the existing submission then.

Gorka, can you help us understand if https://review.opendev.org/#/c/708332/1/tempest/api/volume/admin/test_volume_retype.py is supposed to work with recent stable branches?