Use new iptables syntax
Use new iptables syntax

Move the negation operator (`!`) to be before that option, so that it
also works on openSUSE and not just SLES. New syntax works on both.

crowbar/crowbar,rsalevsky/crowbar,mmnelemane/crowbar,toabctl/crowbar,rhafer/crowbar,tserong/crowbar,aspiers/crowbar,mmnelemane/crowbar,tserong/crowbar,rhafer/crowbar,MaximilianMeister/crowbar,SUSE-Cloud/crowbar,MaximilianMeister/crowbar,rhafer/crowbar,nkrinner/crowbar,toabctl/crowbar,crowbar/crowbar,nkrinner/crowbar,vwallfahrer/crowbar,dirkmueller/crowbar,aspiers/crowbar,aplanas/crowbar,rsalevsky/crowbar,SUSE-Cloud/crowbar,aplanas/crowbar,dirkmueller/crowbar,vwallfahrer/crowbar