The tests were using our keystone module, and therefore
required the keystone client present. This patch changes
the tests to remove that requirement.
Now that we no longer use our own keystone module, but
instead make use of the ansible runtime venv's shade
library and upstream ansible modules, we can eliminate
this package/library being installed on the host.
Change-Id: I3b5066ef0f3f650beb9e057771d8636991d2bce2