Remove neutron lbaas from the offering

Neutron LBaaS was integrated with the hope of being able to use it in
a production capacity. Those dreams were not to be. We have moved on to
building out Octavia and that will be our LBaaS of choice. No sense in
keeping this logic around.
Merge pull request #535 from blueboxgroup/remove-lbaas

Remove neutron lbaas from the offering
Update upstart_service to support start/stop on

It used to be that the upstart_service was being picky about start_on
and stop_on. Make this simpler as some of the neutron services need
explicit ordering. Also support pidfiles.

Reorder site.yml neutron data plane roles.