ComponentManager: switch off parameter services and event publisher

So far, the component manager has no parameters anyway, so no need for
services to configure them or topics to publish events.

An attempt to limit the number of services / topics.
(https://discourse.ros.org/t/ros2-default-behavior-wifi/13460/35)

Signed-off-by: Martijn Buijs <martijn.buijs@gmail.com>

rclcpp_components/src/component_manager.cpp

@@ -34,7 +34,9 @@ ComponentManager::ComponentManager(
   std::weak_ptr<rclcpp::Executor> executor,
   std::string node_name,
   const rclcpp::NodeOptions & node_options)
-: Node(std::move(node_name), node_options),
+: Node(std::move(node_name), rclcpp::NodeOptions(node_options)
+    .start_parameter_services(false)
+    .start_parameter_event_publisher(false)),
   executor_(executor)
 {
   loadNode_srv_ = create_service<LoadNode>(