Modified code pyflakes warning.
Modified code pyflakes warning.

W402 'version_string' imported but unused

Change-Id: I6dad8661c2dc0358821f76b911b13b21e788d738

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