Remove Neutron VPN resources id attributes
Remove Neutron VPN resources id attributes

This patch removes the id attributes from the various Neutron VPN
resources, as people should use Ref.

Change-Id: Idf81d109b930b246791a0f3c22bc04ce5054b939
Closes-Bug: #1230228

openstack/heat,miguelgrinberg/heat,pshchelo/heat,pratikmallya/heat,dragorosson/heat,gonzolino/heat,srznew/heat,noironetworks/heat,rdo-management/heat,rickerc/heat_audit,steveb/heat,openstack/heat,gonzolino/heat,varunarya10/heat,redhat-openstack/heat,dims/heat,JioCloud/heat,redhat-openstack/heat,cwolferh/heat-scratch,miguelgrinberg/heat,jasondunsmore/heat,cryptickp/heat,rickerc/heat_audit,noironetworks/heat,cwolferh/heat-scratch,takeshineshiro/heat,dragorosson/heat,pratikmallya/heat,ntt-sic/heat,rh-s/heat,jasondunsmore/heat,pshchelo/heat,rh-s/heat,steveb/heat,varunarya10/heat,citrix-openstack-build/heat,citrix-openstack-build/heat,cryptickp/heat,rdo-management/heat,NeCTAR-RC/heat,maestro-hybrid-cloud/heat,takeshineshiro/heat,JioCloud/heat,dims/heat,NeCTAR-RC/heat,srznew/heat,ntt-sic/heat,maestro-hybrid-cloud/heat