fix printf

etcdserver2/etcdhttp/http.go

@@ -52,7 +52,7 @@ func Sender(p Peers) func(msgs []raftpb.Message) {
 
 				url += "/raft"
 
-				log.Println("etcdserver: sending to %d@%s", m.To, url)
+				log.Printf("etcdserver: sending to %d@%s", m.To, url)
 
 				// TODO: don't block. we should be able to have 1000s
 				// of messages out at a time.