test: drop unused includes for libinput-util.h

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
test: use check's strcmp API instead of strcmp

Prints out the strings on failure - easier for debugging

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
touchpad: log the invalid event as bug, not just as info

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
touchpad: Prefix tap-debugging message

For consistency with the butto state debugging

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>