firewall: Don't require to enable the RW server for N2N networks.

The firewall rules for OpenVPN have not been applied for N2N
connections when the road warrior server was disabled.
Firewall: remove /var/ipfire/portfw as it is not used anymore
Firewall: Bugfix: When creating a rule and using brackets in comment, the rule is denied because of invalid characters in String. But when creating a rule with just valid characters (witjout brackets) and then editing the rule it is possible to use brackets without errormessage.
Now brackets are allowed.
Firewall: Bugfix: When creating a servcie in firewall-groups and selecting a protocol other than icmp, the enty in the ruletable shows correct values PLUS the "all icmp-types" under ICMP.
Now the ICMP FIeld is emtpy when selecting another protocol than icmp
Firewall: Fix typo in backup script which stops the conversion of old firewallrules