Add Python3 antelope unit tests
Add Python3 antelope unit tests

This is an automatically generated patch to ensure unit testing
is in place for all the of the tested runtimes for antelope.

See also the PTI in governance [1].

[1]: https://governance.openstack.org/tc/reference/project-testing-interface.html

Change-Id: Ied1dbd4a6751b8a9bded9569eb5ea76e72d0b3f4

openstack/oslo.policy