Suppress tf warnings

[caguero]

Now that this patch has been merged into the robot_localization package, we'll need to exercise this functionality.

Until there's a new ROS noetic release, we'll need to install robot_localization manually to observe this functionality working.

How to test it:

1. First, compile robot_localization from source with our patch:

cd <your_vrx_ws>/src
git clone https://github.com/cra-ros-pkg/robot_localization.git
cd ..
catkin_make

2. Launch vrx as usual:

roslaunch vrx_gazebo vrx.launch

3. Launch our localization example

roslaunch wamv_gazebo localization_example.launch

You shouldn't see any warnings.

[M1chaelM]

Thanks for making the change to robot_localization! I confirm this now runs without the repeated warnings.