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: I1f5661b60136da3a48d68fcc77c8cf3161b2799a

openstack/stackviz,openstack/stackviz,openstack/stackviz