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: I6617d6025be66cd7d99c05dd5c0542acf6790dbc

zuul.d/project.yaml

@@ -3,7 +3,7 @@
       - check-requirements
       - openstack-cover-jobs
       - openstack-lower-constraints-master-branch-jobs
-      - openstack-python3-xena-jobs
+      - openstack-python3-yoga-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     check: