refactoring importer
refactoring importer

QC: TUM and SQRL firewall get parsed to exactly same result

diekmann/Iptables_Semantics,diekmann/Iptables_Semantics,diekmann/Iptables_Semantics,jcaesar/Iptables_Semantics,jcaesar/Iptables_Semantics,jcaesar/Iptables_Semantics