Fix to accept transaction_id to all message structs

lib/openflow/multipart/meter/request.ex

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