This is the long overdue conversion from python2 to python3.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.barebox.org/20220908093005.3035259-3-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This contains the host tool for barebox remote control. It is written in
Phython with its own implementation of the RATP protocol. Currently this
is a very simple tool which needs more work, but the code can also be
used as a library.

Example output:

console: '.      '
console: '..     '
console: 'dev    '
console: 'env    '
console: 'mnt    '
console: '\n'
Result: BBPacketCommandReturn(exit_code=0)

Signed-off-by: Jan Lübbe <j.luebbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Tested-by: Andrey Smirnov <andrew.smirnov@gmail.com>