Fix to delete user and group association in Nuage Plugin
Fix to delete user and group association in Nuage Plugin

After a router delete operation, the attached zone to that
router is also deleted. Got rid of code that tried to do
a get operation on the nuage_zone after router delete
operation.
Closes-Bug: #1367864

Change-Id: I01753a472200a961cdcecee703616fd3239abd3c

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