When an interface's state is change to "down", all the route associated with it are deleted without an RTM_DELROUTE event. So when this happen, reset the module to start looking for a new external interface / default route. Fixes #1117
When an interface's state is change to "down", all the route associated with it are deleted without an RTM_DELROUTE event. So when this happen, reset the module to start looking for a new external interface / default route. Fixes #1117