The team working on this effort has scaled it back to remove a
dependency that's been holding up development [0]. This change
has no impact on the current Cinder spec, which was approved
for Train, and whose approved status has been carried along through
Xena. It's now proposed for Yoga.
[0] https://review.opendev.org/c/openstack/glance-specs/+/792134
Change-Id: Ie483be9e82031d8c89dd49c8159373d769e5037d
6d1c94b8fa