Add classmethod decorator to class methods of providervlan ext.
Add classmethod decorator to class methods of providervlan ext.

Change-Id: If26d75b67c4816de0937f9edaa9f55a5bb2197a2

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