support/tests: add runtime test for python-rpi-gpio

Modeled after similar python packages.

However, this one is picky, and throws an exception when it
detects that it is not running on a Raspberry Pi. So we just
catch that exception and check this is what we expect.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Christian Stewart <christian@paral.in>
Cc: Michael Fischer <mf@go-sys.de>
Cc: Asaf Kahlon <asafka7@gmail.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Ian Haylock <haylocki@yahoo.co.uk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>