test/path: Avoid creating ignored test devices

Some tests doesn't use or doesn't need to use the test device
automatically created when adding a test case for certain types of
devices. For these tests, to shorten test run time, don't create the
test devices that would be ignored.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
configure.ac: libinput 0.5

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>