Fix flaky ros2 param list (#656) (#664)

* Use daemon for listing parameter services

This helps avoid incomplete parameter lists due to races with discovery.

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

ros2param/ros2param/verb/list.py

@@ -54,10 +54,11 @@ def main(self, *, args):  # noqa: D102
             node_names = [
                 n for n in node_names if node_name == n.full_name]
 
-        with DirectNode(args) as node:
+        with NodeStrategy(args) as node:
             service_names = get_service_names(
                 node=node, include_hidden_services=args.include_hidden_nodes)
 
+        with DirectNode(args) as node:
             clients = {}
             futures = {}
             # create clients for nodes which have the service