Run keystone module w/ token
Run keystone module w/ token

The fix for https://bugs.launchpad.net/openstack-ansible/+bug/1443955
breaks the tasks using the keystone module.  This commit updates the
rpc_maas role to use a token rather than the keystone service user when
interacting with keystone.  This is the pattern used in other os-a-d
roles.

Closes issue #74

major/rpc-openstack,nrb/rpc-openstack,sigmavirus24/rpc-openstack,jpmontez/rpc-openstack,git-harry/rpc-openstack,jacobwagner/rpc-openstack,miguelgrinberg/rpc-openstack,xeregin/rpc-openstack,robb-romans/rpc-openstack,andymcc/rpc-openstack,claco/rpc-openstack,rcbops/rpc-openstack,sigmavirus24/rpc-openstack,robb-romans/rpc-openstack,miguelgrinberg/rpc-openstack,nrb/rpc-openstack,rcbops/rpc-openstack,miguelgrinberg/rpc-openstack,andymcc/rpc-openstack,busterswt/rpc-openstack,major/rpc-openstack,BjoernT/rpc-openstack,jacobwagner/rpc-openstack,jpmontez/rpc-openstack,mattt416/rpc-openstack,cfarquhar/rpc-openstack,sigmavirus24/rpc-openstack,jpmontez/rpc-openstack,stevelle/rpc-openstack,galstrom21/rpc-openstack,mattt416/rpc-openstack,cloudnull/rpc-openstack,prometheanfire/rpc-openstack,cloudnull/rpc-openstack,darrenchan/rpc-openstack,darrenchan/rpc-openstack,sigmavirus24/rpc-openstack,claco/rpc-openstack,darrenchan/rpc-openstack,nrb/rpc-openstack,hughsaunders/rpc-openstack,xeregin/rpc-openstack,xeregin/rpc-openstack,stevelle/rpc-openstack,shannonmitchell/rpc-openstack,andymcc/rpc-openstack,byronmccollum/rpc-openstack,shannonmitchell/rpc-openstack,xeregin/rpc-openstack,BjoernT/rpc-openstack,stevelle/rpc-openstack,galstrom21/rpc-openstack,cfarquhar/rpc-openstack,prometheanfire/rpc-openstack,hughsaunders/rpc-openstack,claco/rpc-openstack,darrenchan/rpc-openstack,byronmccollum/rpc-openstack,mattt416/rpc-openstack,byronmccollum/rpc-openstack,git-harry/rpc-openstack,mancdaz/rpc-openstack,mancdaz/rpc-openstack,busterswt/rpc-openstack,busterswt/rpc-openstack