route: apply static routes on startup and restart

route: apply static routes on startup and restart

The static routes can only be applied when the network has a valid layer 3  connectivity.
So it is not useful to have a route_init which is called before we have any layer 3  connectivity.
We now call the route_apply every time we set new routes for a zone.
We do this every time we get a new layer 3  connectivity so all routes are applied correctly.

Signed-off-by: Jonatan Schlag <jonatan.schlag@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>