Add Python3 wallaby unit tests
Add Python3 wallaby unit tests

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

See also the PTI in governance [1].

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

Change-Id: I868fbdd9e3cc4658547594d2ca310e99bec3d49d

openstack/vitrage,openstack/vitrage,openstack/vitrage