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: I98553ae1ab9b8b3f530476629dc7f901d5d2bd67

openstack/python-glanceclient,openstack/python-glanceclient