Merge "Add Python3 xena unit tests"

.zuul.yaml

@@ -189,8 +189,8 @@
     templates:
       - openstack-cover-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python3-wallaby-jobs
-      - openstack-python3-wallaby-jobs-arm64
+      - openstack-python3-xena-jobs
+      - openstack-python3-xena-jobs-arm64
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - check-requirements