As of Stein, a minimum of python-cinderclient 4.0.0 is required to
create a volume. Cinder schema no longer accepts additional
properties on volume create that are not part of the API spec [1].

[1] https://review.openstack.org/#/c/573093/

Change-Id: I0fc4d5db39080985b471fe2465b7078e37417e4d
Closes-Bug: #1824017