Add Python3 victoria unit tests

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

See also the PTI in governance [1].

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

Change-Id: Ic7e2083702f57dc138b0421eb9a143e61db8f609

zuul.d/projects.yaml

@@ -4,7 +4,7 @@
       - horizon-non-primary-django-jobs
       - horizon-nodejs10-jobs
       - openstack-lower-constraints-jobs
-      - openstack-python3-ussuri-jobs-horizon
+      - openstack-python3-victoria-jobs-horizon
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
     gate: