The python-cinder package now pulls the required dependency on
python-oslo-policy:

https://github.com/openstack-packages/cinder/blob/a22f32c619c94bf0ac188d4cdcf728c0e71152ea/openstack-cinder.spec#L143

TrivialFix

Change-Id: I504546e75b5a237fc4aac89bd9a5c34f09570817