tests: Convert 'OpenStackAuthTestsV3Base' to mock (pt. 3)
tests: Convert 'OpenStackAuthTestsV3Base' to mock (pt. 3)

Change-Id: Id937a57cc0ca2d9f0f905048d990ac7646d37c1b
Signed-off-by: Stephen Finucane <4725dc7f3632bf126d9fbdc30c347e91e8d2fe16@redhat.com>
Co-Authored-By: Akihiro Motoki <e9c22966286dfb7b63536b5480a1a395590f8876@gmail.com>

ChameleonCloud/horizon,openstack/horizon,ChameleonCloud/horizon,openstack/horizon,openstack/horizon,ChameleonCloud/horizon,openstack/horizon,ChameleonCloud/horizon