coreos/etcd — pull request #1358 by philips (2014-10-22 22:27:50+00:00)
Title: etcdserver: cleanup the cluster ID error message

1) Don't panic since we know exactly where this is coming from and don't
need the user to see a full back trace

2) Add docs explaining this situation a bit further

3) Cleanup the error to look like other similiar errors