cli: accept an args argument on main()
cli: accept an args argument on main()

This will ease the testing.

Signed-off-by: Michael Walle <80e54fab1167aac9a5a5dfc5e0e0a3e5102ca3bd@kontron.com>

kontron/python-aardvark,hthiery/python-aardvark,dnoack/python-aardvark