iio_info.py: update to black and fix pylint issues
iio_info.py: update to black and fix pylint issues

convert tabs to spaces
run black
fix pylint issues
 - variable name too short
 - import order
 - docstring missing
run black again

Signed-off-by: Robin Getz <c66e5a86ef9317cf35cecb2ed063996b2100ed4b@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio