message: Remove duplicate .add_message_type<>() from middleman::init()
diff: @@ -439,11 +439,7 @@ void middleman::init(actor_system_config& cfg) {
  .add_message_type<acceptor_closed_msg>("@acceptor_closed_msg")
  .add_message_type<connection_closed_msg>("@connection_closed_msg")
  .add_message_type<accept_handle>("@accept_handle")
  - .add_message_type<acceptor_closed_msg>("@acceptor_closed_msg")
  - .add_message_type<connection_closed_msg>("@connection_closed_msg")
  .add_message_type<connection_handle>("@connection_handle")
  - .add_message_type<new_connection_msg>("@new_connection_msg")
  - .add_message_type<new_data_msg>("@new_data_msg")
  .add_message_type<connection_passivated_msg>("@connection_passivated_msg")
  .add_message_type<acceptor_passivated_msg>("@acceptor_passivated_msg");
  // compute and set ID for this network node
  