added etcd support

etcd.sh

@@ -0,0 +1,12 @@
+REGISTRY=gcr.io/etcd-development/etcd
+NODE1=127.0.0.1
+docker run \
+  --rm -ti \
+  -p 2379:2379 \
+  -p 2380:2380 \
+  --name etcd ${REGISTRY}:latest \
+  /usr/local/bin/etcd \
+  --data-dir=/etcd-data --name node1 \
+  --initial-advertise-peer-urls http://${NODE1}:2380 --listen-peer-urls http://0.0.0.0:2380 \
+  --advertise-client-urls http://${NODE1}:2379 --listen-client-urls http://0.0.0.0:2379 \
+  --initial-cluster node1=http://${NODE1}:2380