Procfile: use proxy as default

I think it makes sense to make the proxy listen on the default port so
we can give the proxy more testing by default. Also, this should make it
easy to kill a single etcd member and test that etcdctl still works,
etc.

However, I have hit a bug: the proxy takes several seconds

Procfile

@@ -1,5 +1,5 @@
 # Use goreman to run `go get github.com/mattn/goreman`
-etcd1: bin/etcd -name infra1 -listen-client-urls http://localhost:4001 -advertise-client-urls http://localhost:4001 -listen-peer-urls http://localhost:7001 -initial-advertise-peer-urls http://localhost:7001 -initial-cluster-token etcd-cluster-1 -initial-cluster 'infra1=http://localhost:7001,infra2=http://localhost:7002,infra3=http://localhost:7003' -initial-cluster-state new
-etcd2: bin/etcd -name infra2 -listen-client-urls http://localhost:4002 -advertise-client-urls http://localhost:4002 -listen-peer-urls http://localhost:7002 -initial-advertise-peer-urls http://localhost:7002 -initial-cluster-token etcd-cluster-1 -initial-cluster 'infra1=http://localhost:7001,infra2=http://localhost:7002,infra3=http://localhost:7003' -initial-cluster-state new
-etcd3: bin/etcd -name infra3 -listen-client-urls http://localhost:4003 -advertise-client-urls http://localhost:4003 -listen-peer-urls http://localhost:7003 -initial-advertise-peer-urls http://localhost:7003 -initial-cluster-token etcd-cluster-1 -initial-cluster 'infra1=http://localhost:7001,infra2=http://localhost:7002,infra3=http://localhost:7003' -initial-cluster-state new
-proxy: bin/etcd -name proxy1 -proxy=on -listen-client-urls http://localhost:8080 -initial-cluster 'infra1=http://localhost:7001,infra2=http://localhost:7002,infra3=http://localhost:7003'
+etcd1: bin/etcd -name infra1 -listen-client-urls http://127.0.0.1:12379 -advertise-client-urls http://127.0.0.1:12379 -listen-peer-urls http://127.0.0.1:12380 -initial-advertise-peer-urls http://127.0.0.1:12380 -initial-cluster-token etcd-cluster-1 -initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380' -initial-cluster-state new
+etcd2: bin/etcd -name infra2 -listen-client-urls http://127.0.0.1:22379 -advertise-client-urls http://127.0.0.1:22379 -listen-peer-urls http://127.0.0.1:22380 -initial-advertise-peer-urls http://127.0.0.1:22380 -initial-cluster-token etcd-cluster-1 -initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380' -initial-cluster-state new
+etcd3: bin/etcd -name infra3 -listen-client-urls http://127.0.0.1:32379 -advertise-client-urls http://127.0.0.1:32379 -listen-peer-urls http://127.0.0.1:32380 -initial-advertise-peer-urls http://127.0.0.1:32380 -initial-cluster-token etcd-cluster-1 -initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380' -initial-cluster-state new
+proxy: bin/etcd -name infra-proxy1 -proxy=on -listen-client-urls http://127.0.0.1:2379 -initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380'