Same as libinput list-devices, but lists the available event nodes. This
effectively does the same as libinput record without arguments but it's
more obvious in what it is supposed to do and thus easier to point to.
Also, it uses pyudev instead of libevdev so it does not need to run as
root to discover devices.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
