Fix setup of Neutron core plugin in VPNaaS UT
Fix setup of Neutron core plugin in VPNaaS UT

One of the VPNaaS unit test setup routines creates
and extension manager but passes it a class but it
should be passing an instance of that class.

Change-Id: I589cdda0674fdf8fa20d92c2609e1ba6966125d8

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