Add router:tunnel_type to nuage_policy.json
Add router:tunnel_type to nuage_policy.json

Change-Id: If987d3a72f0511b7cf2c9eb7bb0d356035008d81

naveensan1/nuage-openstack-neutron,nuagenetworks/nuage-openstack-neutron,nuagenetworks/nuage-openstack-neutron,naveensan1/nuage-openstack-neutron