carp, provide a way to 'permanently' set carp to 'maintenance mode' (advskew 254) persisting a reboot

--OLD-carp, provide a way to 'permanently' disable carp persisting a reboot to provide a way to cleanly reboot/update a master machine without the issue that not all services are available.-OLD--

Ok revised the code to not disable carp completely, but now set the advskew to 254 when clicking "maintenance mode". This effectively makes it so other backup machines will take and keep the VIP's unless they fail completely. In which case the current machine will become master as a partially working box is probably better then nothing..