zdtm: Wire signalfd00 in

The kernel patch is in 3.5 branch, so we can make this test
run automatically.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -41,6 +41,7 @@ static/selfexe00
 static/unlink_fstat00
 static/unlink_fstat02
 static/eventfs00
+static/signalfd00
 static/inotify00
 static/unbound_sock
 static/fifo-rowo-pair