Consolidate Neutron Networker services (BZ 1093414)

https://bugzilla.redhat.com/show_bug.cgi?id=1093414

Combine ovs and Neutron L3 services into single "Neutron Networker" service.
Service params for this hostgroup/role are now metadata-driven from the
puppetclasses.
Merge pull request #134 from sseago/consolidate-neutron-networker

Consolidate Neutron Networker services (BZ 1093414)