No Output to Screen for JTC Commands in the Demos

[jackcenter]

Is your feature request related to a problem? Please describe. In the demos ros2 launch ros2_control_demo_bringup test_joint_trajectory_controller.launch.py publisher_config:=rrbot_namespace_joint_trajectory_publisher.yaml doesn't output the commands to the screen like the other controllers do.

Describe the solution you'd like I was planning on adding the output to the test nodes here

Describe alternatives you've considered Could assume the user knows how to echo the topic, or explain this in the tutorials. But I think printing the command to the console matches the other examples.

Additional context Reference conversation can be found here in ros-controls/ros2_control_demos#170

[jackcenter]

I am planning to work on this.

[destogl]

Close because the node is moved to another repo and should be solved in #389