dnn_rotate and fiducial_follow both fail in Noetic

[anfederman]

There are no error messages on the build or launch, but neither work.

rostopic echo /dnn_objects ERROR: Cannot load message class Are your messages built? No objects are detected.

fiducial_follow marker is detected and co-ordinates are echoed, but no cmd_vel topics sent. The robot is still drive-able with the joystick, so I am not sure if it is a mux issue, or missing transform.

The only edits were to python print statements to add parenthesis.

I have no way to test the other demos like partybot, roshub, etc.

[anfederman]

I think I had fiducial follow working in Noetic previously, but now when it detects the marker it goes backward violently. I thought it might be due to the camera being flipped in magni vs. breadcrumb, but I am unsure how to fix this. I tried to use the rapicam_flip node with vertical flip set to true, but this didn't help.