Modified code Pyflakes warning.
Modified code Pyflakes warning.

File api.py:
W402 'q_exc' imported but unused

Change-Id: Ibe8fa9c3b3607165bcd30867ef0df71aea04806b

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