Oslo policy moved those parameters to the DeprecatedRule object in [1]
and deprecated it in DocumentedRule object.
To avoid many deprecation warnings e.g. in our tests, this patch moves
"deprecated_since" and "deprecated_reason" parameters to the
DeprecatedRule object.
That change requires also bump of the oslo_policy to the 3.7.0 version
as change [1] isn't available in oslo_policy 3.6.2.
Additionally this patch also changes simple string "Wallaby" to
oslo_log.versionutils constant.
[1] https://review.opendev.org/c/openstack/oslo.policy/+/766628
Change-Id: I3234e04f417171db0d90e3e70661cc69bff8a4b1
67a9f46d80