Add test_handle_router_snat_rules_add_rules
Add test_handle_router_snat_rules_add_rules

Add a unit test to verify that snat rules are added and added in order.
So that it could be refactored without fear next time.

Closes-Bug: #1222660
Change-Id: I07e820cc28c9a6c139a8eed0917aef2cfe62638a

silenci/neutron,silenci/neutron,takeshineshiro/neutron,skyddv/neutron,miyakz1192/neutron,noironetworks/neutron,shahbazn/neutron,mandeepdhami/neutron,JianyuWang/neutron,javaos74/neutron,antonioUnina/neutron,igor-toga/local-snat,vveerava/Openstack,leeseuljeong/leeseulstack_neutron,klmitch/neutron,vbannai/neutron,vveerava/Openstack,cisco-openstack/neutron,Stavitsky/neutron,igor-toga/local-snat,MaximNevrov/neutron,huntxu/neutron,Juniper/contrail-dev-neutron,Juniper/neutron,mmnelemane/neutron,NeCTAR-RC/neutron,oeeagle/quantum,bigswitch/neutron,asgard-lab/neutron,magic0704/neutron,blueboxgroup/neutron,jumpojoy/neutron,Juniper/neutron,sasukeh/neutron,magic0704/neutron,vijayendrabvs/ssl-neutron,yamahata/neutron,CiscoSystems/vespa,NeCTAR-RC/neutron,cloudbase/neutron-virtualbox,Stavitsky/neutron,projectcalico/calico-neutron,virtualopensystems/neutron,ntt-sic/neutron,openstack/neutron,watonyweng/neutron,adelina-t/neutron,Juniper/neutron,apporc/neutron,glove747/liberty-neutron,vijayendrabvs/hap,leeseulstack/openstack,mattt416/neutron,jerryz1982/neutron,ntt-sic/neutron,glove747/liberty-neutron,asgard-lab/neutron,vbannai/neutron,cisco-openstack/neutron,beagles/neutron_hacking,mmnelemane/neutron,virtualopensystems/neutron,gopal1cloud/neutron,Juniper/contrail-dev-neutron,vivekanand1101/neutron,watonyweng/neutron,SmartInfrastructures/neutron,JioCloud/neutron,bgxavier/neutron,swdream/neutron,chitr/neutron,jumpojoy/neutron,noironetworks/neutron,CiscoSystems/neutron,aristanetworks/neutron,yamahata/tacker,jacknjzhou/neutron,CiscoSystems/neutron,Comcast/neutron,waltBB/neutron_read,cloudbase/neutron,leeseuljeong/leeseulstack_neutron,eayunstack/neutron,SamYaple/neutron,Metaswitch/calico-neutron,barnsnake351/neutron,wenhuizhang/neutron,aristanetworks/neutron,beagles/neutron_hacking,infobloxopen/neutron,yamahata/neutron,rdo-management/neutron,suneeth51/neutron,leeseulstack/openstack,dims/neutron,zhhf/charging,zhhf/charging,vijayendrabvs/hap,sebrandon1/neutron,adelina-t/neutron,CiscoSystems/vespa,neoareslinux/neutron,redhat-openstack/neutron,alexandrucoman/vbox-neutron-agent,vijayendrabvs/ssl-neutron,javaos74/neutron,SmartInfrastructures/neutron,bgxavier/neutron,gopal1cloud/neutron,mahak/neutron,blueboxgroup/neutron,MaximNevrov/neutron,barnsnake351/neutron,yanheven/neutron,cernops/neutron,jacknjzhou/neutron,eonpatapon/neutron,wenhuizhang/neutron,Comcast/neutron,skyddv/neutron,SamYaple/neutron,paninetworks/neutron,blueboxgroup/neutron,leeseulstack/openstack,eayunstack/neutron,neoareslinux/neutron,vijayendrabvs/hap,beagles/neutron_hacking,JianyuWang/neutron,CiscoSystems/neutron,Juniper/contrail-dev-neutron,oeeagle/quantum,wolverineav/neutron,virtualopensystems/neutron,yamahata/neutron,mandeepdhami/neutron,ntt-sic/neutron,miyakz1192/neutron,gkotton/neutron,pnavarro/neutron,sajuptpm/neutron-ipam,alexandrucoman/vbox-neutron-agent,wolverineav/neutron,cloudbase/neutron,Comcast/neutron,sebrandon1/neutron,antonioUnina/neutron,apporc/neutron,yamahata/tacker,yuewko/neutron,infobloxopen/neutron,zhhf/charging,openstack/neutron,dhanunjaya/neutron,vbannai/neutron,mahak/neutron,bigswitch/neutron,shahbazn/neutron,jerryz1982/neutron,gkotton/neutron,gkotton/neutron,vijayendrabvs/ssl-neutron,redhat-openstack/neutron,dhanunjaya/neutron,suneeth51/neutron,eonpatapon/neutron,sajuptpm/neutron-ipam,chitr/neutron,projectcalico/calico-neutron,cernops/neutron,sajuptpm/neutron-ipam,pnavarro/neutron,dims/neutron,klmitch/neutron,vveerava/Openstack,takeshineshiro/neutron,sasukeh/neutron,JioCloud/neutron,openstack/neutron,swdream/neutron,yuewko/neutron,cloudbase/neutron-virtualbox,waltBB/neutron_read,Metaswitch/calico-neutron,vivekanand1101/neutron,mahak/neutron,yamahata/tacker,mattt416/neutron,rdo-management/neutron,yanheven/neutron,huntxu/neutron,CiscoSystems/vespa,paninetworks/neutron,leeseuljeong/leeseulstack_neutron