[wip/{ → py-}prf-ros-control]

Affected packages:
- wip/pal-hardware-gazebo-melodic
- wip/pal-hardware-gazebo
- wip/play-motion
- wip/pal-transmissions
- wip/prf-ros-controllers
- wip/talos-dev
- wip/pal-hardware-interfaces
- wip/prf-teleop-tools
- wip/py-roscontrol-sot
- wip/prf-gazebo-ros-pkgs-melodic
- wip/prf-gazebo-ros-pkgs