message: Forward remote_spawn with local node ID to system
diff: @@ -161,6 +161,8 @@ public:
  timespan timeout = timespan{std::chrono::minutes{1}}) {
  if (!nid || name.empty())
  return sec::invalid_argument;
  + if (nid == system().node())
  + return system().spawn<Handle>(std::move(name), std::move(args));
  auto res = remote_spawn_impl(nid, name, args,
  system().message_types<Handle>(), timeout);
  if (!res)
  