[Foxy] Replace / Remove ros2_control_test_nodes dependency

[fmauch]

The test scripts depend on ros2_control_test_nodes, which is not released for Foxy (and probably will not, since for galactic+ it is included into ros2_controllers). We could provide our own testing script instead.

[fmauch]

@destogl you might have an opinion on this, as you've created the script as far as I can see...

[destogl]

@bmagyar can we merge and release test nodes also for foxy? Do you see any issues/complexities with that as “release master”?

[fmauch]

@bmagyar Any updates on this? I've implemented a hacky workaround in #373 which would not technically stop us from doing a release, but I don't feel very great about that...

[fmauch]

Tagging this with a wontfix for now, going with the hacky #373.

[jonathanhyunmoon]

Hello, I'm new here. I am trying to build this for foxy on the UR5. I want to run ros2 launch ur_bringup test_joint_trajectory_controller.launch.py, but I am failing to do for the fact that the executable 'publisher_joint_trajectory_controller' doesn't exist in ros2_control_test_nodes. My understanding is that this is because ros2_control_test_nodes doesn't exist yet (Or ever will?).

Is there a hacky workaround for this?

[fmauch]

@jmoon0714 I guess your problem just got fixed in #514