Make pppoe reset work again with new <if> naming scheme.
Previous commit also moved pppoe reset functions to interfaces.incso we don't have to duplicate in interfaces.php and interfaces_ppps_edit.php
Also, add code so that when ppp config section gets deleted, associated <cron>item gets deleted for pppoe-reset cron items.
Make pppoe reset work again with new <if> naming scheme.
Previous commit also moved pppoe reset functions to interfaces.inc
so we don't have to duplicate in interfaces.php and interfaces_ppps_edit.php
Also, add code so that when ppp config section gets deleted, associated <cron>
item gets deleted for pppoe-reset cron items.