Update the spec : remove RTs consolidation part
Update the spec : remove RTs consolidation part

RTs consolidation specified in the spec is currently not implemented.
This consolidation will have to be done at the driver level,
not at the plugin level.

Change-Id: I3b3cbbf0846f8caadb4e7ce105bd33eac460dfe9
Closes-bug: 1478998

openstack/networking-bgpvpn,openstack/networking-bgpvpn,openstack/networking-bgpvpn