Add Python3 zed unit tests

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

See also the PTI in governance [1].

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

Change-Id: I89269783a6b8c6fc5824abbd2d1558be21683666

zuul.d/projects.yaml

@@ -6,7 +6,7 @@
       - periodic-stable-jobs-neutron
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python3-yoga-jobs
+      - openstack-python3-zed-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
       - octavia-tox-tips