Method sync

src/parameter/shared_parameter.h:17–21

convenient wrappers of functions in remote_node.h

      : Customer(my_name, parent_name) { }
  // convenient wrappers of functions in remote_node.h
  int sync(MessagePtr msg) {
    CHECK(msg->task.shared_para().has_cmd()) << msg->debugString();
    if (!msg->task.has_key_range()) Range<K>::all().to(msg->task.mutable_key_range());
    return port(msg->recver)->submit(msg);
  }
  int push(MessagePtr msg) {
    set(msg)->set_cmd(CallSharedPara::PUSH);
    return sync(msg);