Add a cloud profile for system-admins
Add a cloud profile for system-admins

Keystone's bootstrap process will create administrative role assignments
for the admin user on an admin project. It will also do this for system
role assignments.

Let's create a cloud profile specifically for system-scoped access. This
will be useful as we adopt more secure RBAC personas and convert tripleo
plumbing to interact with administrative APIs using system-scoped tokens
(as more projects adopt system-admin).

Change-Id: I3471dd1da3ea8987ae6dcb25a7e5fbc0b573e89b

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates