Add group to policy management

Add group to policy management

The move of policy.json into code means the file may not exist. We've
added support to ensure that the file exists in the openstacklib but we
need to make sure the permissions are right for each service. This adds
the group information to the policies so it works right.

Depends-On: I26e8b1384f4f69712da9d06a4c565dfd1f17c9ed
Change-Id: I3b4d162e4ba79f1dcc9e98e7a600b3b3203018f3
Co-Authored-By: Alex Schultz <aschultz@redhat.com>