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.
To do this, we also ensure that the functional test
now uses the Ansible runtime venv for all OpenStack
modules, and we use the native Ansible OpenStack
modules instead of our own.
Change-Id: I0ecb55308a846ad0f1bb05c10b9e0aad3da15449
cd17cb20d7