Fix etcd user for etcd-proxy service

Only affects sys V OSes (Ubuntu 14.04)

Fixes ##383

roles/etcd/templates/deb-etcd-proxy-docker.initd.j2

@@ -28,7 +28,7 @@ DAEMON_ARGS='--restart=always --env-file=/etc/etcd-proxy.env \
 
 
 SCRIPTNAME=/etc/init.d/$NAME
-DAEMON_USER=etcd-proxy
+DAEMON_USER=etcd
 STOP_SCHEDULE="${STOP_SCHEDULE:-QUIT/5/TERM/5/KILL/5}"
 PID=/var/run/etcd-proxy.pid