Closes #77 Allow IPv4/6 address as tunnel network on overrides

[TTPBruce]

No description provided.

[opoplawski]

Thank you for the PR. Ideally I'd like to get closer to pfSense's validation:

function openvpn_validate_tunnel_network($value, $ipproto) {
        $value = trim($value);
        if (!empty($value)) {
                if (is_alias($value) && (alias_get_type($value) == 'network')) {
                        $net = alias_to_subnets_recursive($value);
                        if ((!is_subnetv4($net[0]) && ($ipproto == 'ipv4')) ||
                            (!is_subnetv6($net[0]) && ($ipproto == 'ipv6')) ||
                            (count($net) > 1)) {
                                return false;
                        }
                        return true;
                } else {
                        if ((!is_subnetv4($value) && ($ipproto == 'ipv4')) ||
                            (!is_subnetv6($value) && ($ipproto == 'ipv6'))) {
                                return false;
                        }
                }
        }
        return true;
}

But this may be a good first step. Let's see how difficult this is.

[opoplawski]

Closed in preference for #110