udev: make sure the udev callout path is valid for a test run

udev: make sure the udev callout path is valid for a test run

udev requires callout binaries to sit in /lib/udev or otherwise provide an
absolute path. The test suite should work without installing everything first,
so create two rule files - one to install, one with the path to the
$builddir/test

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>