Etcd configuration

We'd like to inject the etcd configuration via cli args. But there is still a supervisor in the docker container. So it's time to remove it and link a redis container.

* Inject etcd configuration via cli args
* Overwrite redis configuration via env vars from docker links
this is just the default as you don't know the hosts ip. you can use the `--etcdhost=` parameter to set the configuration to a different ip.