Add Python3 yoga unit tests

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

See also the PTI in governance [1].

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

Change-Id: Ibb1f0b5a7740d36fda7be637f21802e31623baba

Author: openstackadmin

.zuul.yaml

@@ -2,7 +2,7 @@
     templates:
       - check-requirements
 #     - openstack-lower-constraints-jobs
-      - openstack-python3-xena-jobs
+      - openstack-python3-yoga-jobs
       - openstackclient-plugin-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3