Remove dead code
Remove dead code

Since VPNaaS has been updated, the get_snat_ns_name() method
is no longer needed.

Change-Id: Id852614efc5ef20f8dc2c8ed5cd0b97b354e995e
Closes-Bug: #1430967

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