Update _cur names to _current in iptables_firewall.py
Update _cur names to _current in iptables_firewall.py

_cur names were obscure, their actual meaning was _current.

Partially implements blueprint refactor-iptables-firewall-driver

Change-Id: I80df11d845bea5f683b9910fb1020a3f9c04a648

jumpojoy/neutron,JianyuWang/neutron,jacknjzhou/neutron,aristanetworks/neutron,bigswitch/neutron,jumpojoy/neutron,bgxavier/neutron,pnavarro/neutron,mahak/neutron,wenhuizhang/neutron,klmitch/neutron,cloudbase/neutron-virtualbox,apporc/neutron,waltBB/neutron_read,dhanunjaya/neutron,huntxu/neutron,shahbazn/neutron,cisco-openstack/neutron,waltBB/neutron_read,chitr/neutron,SmartInfrastructures/neutron,mandeepdhami/neutron,yanheven/neutron,antonioUnina/neutron,alexandrucoman/vbox-neutron-agent,yuewko/neutron,sasukeh/neutron,barnsnake351/neutron,eayunstack/neutron,noironetworks/neutron,wolverineav/neutron,mmnelemane/neutron,cloudbase/neutron,jacknjzhou/neutron,yanheven/neutron,barnsnake351/neutron,antonioUnina/neutron,neoareslinux/neutron,miyakz1192/neutron,asgard-lab/neutron,suneeth51/neutron,swdream/neutron,eonpatapon/neutron,vivekanand1101/neutron,silenci/neutron,jerryz1982/neutron,takeshineshiro/neutron,SmartInfrastructures/neutron,glove747/liberty-neutron,aristanetworks/neutron,neoareslinux/neutron,blueboxgroup/neutron,yuewko/neutron,mandeepdhami/neutron,miyakz1192/neutron,igor-toga/local-snat,NeCTAR-RC/neutron,infobloxopen/neutron,shahbazn/neutron,eayunstack/neutron,bgxavier/neutron,JianyuWang/neutron,mattt416/neutron,igor-toga/local-snat,suneeth51/neutron,openstack/neutron,vivekanand1101/neutron,wenhuizhang/neutron,bigswitch/neutron,jerryz1982/neutron,huntxu/neutron,chitr/neutron,cloudbase/neutron-virtualbox,sebrandon1/neutron,mmnelemane/neutron,sasukeh/neutron,openstack/neutron,silenci/neutron,skyddv/neutron,adelina-t/neutron,magic0704/neutron,openstack/neutron,javaos74/neutron,magic0704/neutron,dims/neutron,wolverineav/neutron,MaximNevrov/neutron,blueboxgroup/neutron,asgard-lab/neutron,mahak/neutron,alexandrucoman/vbox-neutron-agent,sebrandon1/neutron,cisco-openstack/neutron,watonyweng/neutron,mattt416/neutron,JioCloud/neutron,blueboxgroup/neutron,paninetworks/neutron,noironetworks/neutron,dhanunjaya/neutron,watonyweng/neutron,Stavitsky/neutron,JioCloud/neutron,pnavarro/neutron,SamYaple/neutron,MaximNevrov/neutron,rdo-management/neutron,dims/neutron,mahak/neutron,klmitch/neutron,skyddv/neutron,paninetworks/neutron,NeCTAR-RC/neutron,SamYaple/neutron,javaos74/neutron,eonpatapon/neutron,swdream/neutron,cloudbase/neutron,infobloxopen/neutron,Stavitsky/neutron,takeshineshiro/neutron,adelina-t/neutron,apporc/neutron,glove747/liberty-neutron,rdo-management/neutron