The datadir module provides general-purpose data file lookup
utilities that are not specific to system emulation. Move it
to util/ so it can be reused more broadly.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
