Add "test-driver" and "compile" to .gitignore

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Fix "." in description of utun.

Signed-off-by: Gert Doering <gert@greenie.muc.de>