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: If2ba76466a7235531dfc52db37e13bcd235c8b5c

zuul.d/project.yaml

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