Add Python3 yoga unit tests
Add Python3 yoga unit tests

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

See also the PTI in governance [1].

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

Change-Id: I8ac3f528c33ed039131d83c23b49be8f7471586d

openstack/heat-translator,openstack/heat-translator