Robot controller

### Description

@GPrathap @hariharan20 how does the controller is configured for the real robot?? it seems this file is being used: https://github.com/LCAS/hunter_ros2/blob/master/hunter_base/config/hardware_controllers.yaml ?? 

This is wrong as this configure it as a diff driver but I do not know what is going on in the internal driver, can you please comment on this? 