Enables packetfilter ext in NEC plugin based on its driver config
Enables packetfilter ext in NEC plugin based on its driver config

packet filter extension in NEC plugin should be determined based on
a return value of filter_supported method in the backend driver.
Previously filter_supported was not called actually and packetfilter
extension was always enabled.

Fixes bug #1133100

Change-Id: I1334c7695e64bc942c0ecce2bd85e5a92e75b388

yamahata/neutron,skyddv/neutron,ykaneko/quantum,vijayendrabvs/ssl-neutron,noironetworks/neutron,watonyweng/neutron,yamahata/tacker,takeshineshiro/neutron,yamahata/tacker,sajuptpm/neutron-ipam,Brocade-OpenSource/OpenStack-DNRM-Neutron,miyakz1192/neutron,eayunstack/neutron,rdo-management/neutron,cloudbase/neutron-virtualbox,jumpojoy/neutron,NeCTAR-RC/neutron,yuewko/neutron,Metaswitch/calico-neutron,netscaler/neutron,liqin75/vse-vpnaas-plugin,glove747/liberty-neutron,yamahata/neutron,Juniper/contrail-dev-neutron,CiscoSystems/vespa,CiscoSystems/quantum,zhhf/charging,dhanunjaya/neutron,SamYaple/neutron,yamt/neutron,virtualopensystems/neutron,kaiweifan/vse-lbaas-plugin-poc,vbannai/neutron,bigswitch/neutron,ykaneko/neutron,ykaneko/quantum,gopal1cloud/neutron,igor-toga/local-snat,dims/neutron,gkotton/neutron,mandeepdhami/neutron,igor-toga/local-snat,JioCloud/neutron,blueboxgroup/neutron,vveerava/Openstack,netscaler/neutron,huntxu/neutron,mattt416/neutron,jacknjzhou/neutron,liqin75/vse-vpnaas-plugin,sebrandon1/neutron,vbannai/neutron,pnavarro/neutron,rdo-management/neutron,beagles/neutron_hacking,kaiweifan/neutron,bigswitch/neutron,Comcast/neutron,neoareslinux/neutron,redhat-openstack/neutron,JioCloud/neutron,klmitch/neutron,mmnelemane/neutron,asgard-lab/neutron,apporc/neutron,Juniper/neutron,waltBB/neutron_read,gopal1cloud/neutron,yuewko/neutron,wenhuizhang/neutron,vivekanand1101/neutron,cisco-openstack/neutron,wolverineav/neutron,vbannai/neutron,armando-migliaccio/neutron,beagles/neutron_hacking,CiscoSystems/neutron,miyakz1192/neutron,Juniper/neutron,blueboxgroup/neutron,shahbazn/neutron,netscaler/neutron,leeseulstack/openstack,vijayendrabvs/hap,barnsnake351/neutron,vijayendrabvs/hap,ntt-sic/neutron,CiscoSystems/quantum,swdream/neutron,openstack/neutron,Metaswitch/calico-neutron,mahak/neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron,waltBB/neutron_read,dims/neutron,rickerc/neutron_audit,alexandrucoman/vbox-neutron-agent,eonpatapon/neutron,neoareslinux/neutron,javaos74/neutron,CiscoSystems/vespa,tpaszkowski/quantum,jerryz1982/neutron,kaiweifan/vse-lbaas-plugin-poc,vijayendrabvs/ssl-neutron,mahak/neutron,liqin75/vse-vpnaas-plugin,ykaneko/neutron,Stavitsky/neutron,swdream/neutron,rickerc/neutron_audit,cernops/neutron,vveerava/Openstack,skyddv/neutron,leeseuljeong/leeseulstack_neutron,kaiweifan/neutron,gkotton/neutron,wenhuizhang/neutron,wolverineav/neutron,citrix-openstack-build/neutron,sasukeh/neutron,Comcast/neutron,MaximNevrov/neutron,Comcast/neutron,takeshineshiro/neutron,zhhf/charging,sajuptpm/neutron-ipam,MaximNevrov/neutron,asgard-lab/neutron,yanheven/neutron,paninetworks/neutron,ykaneko/neutron,yamt/neutron,Stavitsky/neutron,redhat-openstack/neutron,chitr/neutron,beagles/neutron_hacking,ntt-sic/neutron,JianyuWang/neutron,vijayendrabvs/hap,liqin75/vse-vpnaas-plugin,cisco-openstack/neutron,Brocade-OpenSource/OpenStack-DNRM-Neutron,leeseuljeong/leeseulstack_neutron,magic0704/neutron,JianyuWang/neutron,CiscoSystems/vespa,ykaneko/quantum,cloudbase/neutron-virtualbox,apporc/neutron,jumpojoy/neutron,bgxavier/neutron,leeseulstack/openstack,Juniper/neutron,zhhf/charging,adelina-t/neutron,silenci/neutron,kaiweifan/vse-lbaas-plugin-poc,projectcalico/calico-neutron,huntxu/neutron,eonpatapon/neutron,CiscoSystems/neutron,magic0704/neutron,sajuptpm/neutron-ipam,armando-migliaccio/neutron,citrix-openstack-build/neutron,aristanetworks/neutron,oeeagle/quantum,mmnelemane/neutron,yamt/neutron,vijayendrabvs/ssl-neutron,vivekanand1101/neutron,ykaneko/quantum,Juniper/contrail-dev-neutron,chitr/neutron,citrix-openstack-build/neutron,leeseulstack/openstack,suneeth51/neutron,jerryz1982/neutron,javaos74/neutron,adelina-t/neutron,mandeepdhami/neutron,rickerc/neutron_audit,bgxavier/neutron,tpaszkowski/quantum,cloudbase/neutron,barnsnake351/neutron,kaiweifan/neutron,infobloxopen/neutron,mahak/neutron,armando-migliaccio/neutron,cloudbase/neutron,gkotton/neutron,klmitch/neutron,antonioUnina/neutron,blueboxgroup/neutron,watonyweng/neutron,shahbazn/neutron,antonioUnina/neutron,virtualopensystems/neutron,Juniper/contrail-dev-neutron,CiscoSystems/neutron,noironetworks/neutron,suneeth51/neutron,CiscoSystems/quantum,openstack/neutron,kaiweifan/vse-lbaas-plugin-poc,paninetworks/neutron,silenci/neutron,SmartInfrastructures/neutron,openstack/neutron,oeeagle/quantum,aristanetworks/neutron,sasukeh/neutron,infobloxopen/neutron,NeCTAR-RC/neutron,ntt-sic/neutron,vveerava/Openstack,armando-migliaccio/neutron,alexandrucoman/vbox-neutron-agent,projectcalico/calico-neutron,glove747/liberty-neutron,tpaszkowski/quantum,virtualopensystems/neutron,mattt416/neutron,eayunstack/neutron,yamahata/tacker,yamt/neutron,SmartInfrastructures/neutron,sebrandon1/neutron,SamYaple/neutron,leeseuljeong/leeseulstack_neutron,tpaszkowski/quantum,yamahata/neutron,pnavarro/neutron,yanheven/neutron,cernops/neutron,jacknjzhou/neutron,dhanunjaya/neutron