Add consul free service plan.

The bound port is for the HTTP endpoint (8500/tcp).

There are other ports available:

    Client Addr: 127.0.0.1 (HTTP: 8500, DNS: 8600, RPC: 8400)
    Cluster Addr: 192.168.1.43 (LAN: 8301, WAN: 8302)

See http://www.consul.io/docs/agent/basics.html