Dogfood things for unit tests
Dogfood things for unit tests

So it turns out we weren't actually using ostestr for running the
os-testr unit tests. We probably should use the test runner runner
wrapper we're developing to run the unit tests for the test runner
runner wrapper and the other utilities in the package.

Change-Id: I88af9104352163f2412c2a3cbaf6c88d0a937988

tonyli71/os-testr,dims/os-testr,openstack/os-testr