We used to create some iptables rules that permitted traffic to the
firewall from IPsec peers. This however doesn't work due to changes in
iana-etc and it looks like those rules are entirely absolete now.
This patch removes them which should not cause any functional changes.
Fixes: #12808 Signed-off-by: Michael Tremer <michael.tremer@ipfire.org> Acked-by: Peter Müller <peter.mueller@ipfire.org>