Enable Neutron LBaaS and FWaaS services

Previous versions of puppet_openstack_builder don't provide the
mappings necessary for users to make use of the Neutron
load-balancing-as-a-service and firewall-as-a-services features.
This patch adds mappings to enable the lbaas agent, the fwaas
service, and to enable Horizon support for both.

Implements: blueprint support-lbaas