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: I83e826787e18cdf30e3788da3f1c2df15f1e61e2

Author: openstackadmin

.zuul.yaml

@@ -4,7 +4,7 @@
       - designate-devstack-jobs
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python3-xena-jobs
+      - openstack-python3-yoga-jobs
       - openstackclient-plugin-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3