feat(config): remove the info file

The info file was meant to help the user from accidently making a
mistake but often times it just confuses people:

https://github.com/coreos/etcd/issues/356
https://github.com/coreos/etcd/issues/531
https://github.com/coreos/etcd/issues/318

Lets remove the info file for this next release.

server/info.go

@@ -1,17 +0,0 @@
-package server
-
-// Info describes the non-mutable state of the server upon initialization.
-// These fields cannot be changed without deleting the server fields and
-// reinitializing.
-type Info struct {
-	Name string `json:"name"`
-
-	RaftURL string `json:"raftURL"`
-	EtcdURL string `json:"etcdURL"`
-
-	RaftListenHost string `json:"raftListenHost"`
-	EtcdListenHost string `json:"etcdListenHost"`
-
-	RaftTLS TLSInfo `json:"raftTLS"`
-	EtcdTLS TLSInfo `json:"etcdTLS"`
-}