use more defaults and simplify our options
use more defaults and simplify our options

This change removes several of our more complex arguments for Ansible.
This will make things easier to understand and debug as we'll no longer
be fully off the reservation.

Change-Id: If9afaaf75bd29aeb6f9a8b7a849398ca1c42c00d
Signed-off-by: Kevin Carter <1d9a750a4fc7026fb02029431dc8a87d24487135@redhat.com>

openstack/python-tripleoclient