Added support for allowing inbound traffic from given IPv4/IPv6 addresses

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
Fixed rule duplication issue

Previously packetfilter rules had the defined IPv4/IPv6 address in the rule
title/comment. While this was nice, it also meant that changing the allowed
IP-addresses would result in new rules being created instead of the old one
being replaced. Removed the IP-address from the names/comments to fix this bug.

Signed-off-by: Samuli Seppänen <samuli@openvpn.net>