These add some coverage to functionality not covered by the regular
unit tests, but I think they can't be run in the gate because they
use sudo.
Change-Id: Ic62c95b83f68f94328deb00227b7eabf249ce898
According to Openstack summit session [1],
stestr is maintained project to which all Openstack projects should migrate.
Let's switch to stestr as other projects have already moved to it.
[1] https://etherpad.openstack.org/p/YVR-python-pti
Change-Id: I06d7b72fcaa4ce1f8764fd51635ae8239ea649b2