can: j1939: rename jacd tool

Due to naming conflicts, jacd was renamed to j1939acd in:

    https://github.com/linux-can/can-utils/pull/199



Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Link: https://lore.kernel.org/r/20201020081134.3597-1-yegorslists@googlemail.com
Link: https://github.com/linux-can/can-utils/pull/199


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>