Fix to accept transaction_id to all message structs

lib/openflow/multipart/port_stats/request.ex

@@ -12,10 +12,17 @@ defmodule Openflow.Multipart.PortStats.Request do
 
   def ofp_type, do: 18
 
-  def new(port_no \\ :any) do
+  def new(port_no) when is_integer(port_no) or is_atom(port_no) do
     %Request{port_number: port_no}
   end
 
+  def new(options) when is_list(options) do
+    %Request{
+      xid: options[:xid] || 0,
+      port_number: options[:port_no] || :any
+    }
+  end
+
   def read(<<port_no_int::32, _::size(4)-unit(8)>>) do
     port_no = Openflow.Utils.get_enum(port_no_int, :openflow13_port_no)
     %Request{port_number: port_no}