Update rabbit/quantum user/pass, variables(1087359,1090422,1090338)

Site.pp.example has a variable for rabbit, but core.pp was
using fixed names, causing potential build failures.  fixed
openstack_rabbit_user to be consistent for quantum uses.
Also changed the quantum queue to '/' as with the rest of the
services.  Cleaned up modules as well, added the missing boolean
module.

Also removed a few historical (nova-network related) variables
from site.pp.example.

Addresses:
floating ip (site.pp.example)
https://bugs.launchpad.net/openstack-cisco/folsom/+bug/1087359
multi-host (site.pp.example)
https://bugs.launchpad.net/openstack-cisco/folsom/+bug/1090422
https://bugs.launchpad.net/openstack-cisco/folsom/+bug/1090338

Doesn't seem like anyone else was running into the core.pp quantum issue,
which leads me to believe people aren't actually buiding from _scratch_