Test and fix notify

More tests and add RemoteAddr to State, prolly LocalAddr will be

useful as well.

Fixed and tested IsNotify method.

middleware/file/notify.go

@@ -19,7 +19,7 @@ func (z *Zone) isNotify(state middleware.State) bool {
 	if len(z.TransferFrom) == 0 {
 		return false
 	}
-	remote := middleware.Addr(state.IP()).Normalize()
+	remote := state.RemoteAddr()
 	for _, from := range z.TransferFrom {
 		if from == remote {
 			return true