reboot: Reboot via Finit + watchdogd may take a while

This patch increases the default wait, 2 --> 5 sec, while pending for
Finit + watchdogd controlled reboot/shutdown.  We don't want to hand
back the prompt when we're not really ready yet.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/reboot.c

@@ -207,7 +207,7 @@ int main(int argc, char *argv[])
 
 	if (c)
 		err(1, "Failed signalling init to %s", msg);
-	do_sleep(2);
+	do_sleep(5);
 
 	return 0;
 }