As asked by CNTT RA1, "Cinder volume revert to snapshot" is mandatory.
It asks for an update from Ocata to Pike or newer.
https://cntt-n.github.io/CNTT/doc/ref_arch/openstack/chapters/chapter05.html
https://specs.openstack.org/openstack/cinder-specs/specs/pike/cinder-volume-revert-by-snapshot.html
cinder_tempest_plugin.api.volume.test_volume_revert.VolumeRevertTests.test_volume_revert_to_snapshot
cinder_tempest_plugin.api.volume.test_volume_revert.VolumeRevertTests.test_volume_revert_to_snapshot_after_extended_negative
rabi_abdel jamesgu fuqiao sridharkn KSevilla