message: add should_mac_message config parameter
diff: @@ -125,6 +125,7 @@ namespace pbft
  general_info.num_replicas = 1;
  general_info.num_clients = 1;
  general_info.max_faulty = 0;
  + general_info.should_mac_message = false;
  general_info.service_name = "generic";
  general_info.auth_timeout = 1800000;
  general_info.view_timeout = 5000;
  