Modified code Pyflakes warning.
Modified code Pyflakes warning.

File utils.py:
W402 'datetime' imported but unused
W402 'inspect' imported but unused
W402 'exception' imported but unused

Change-Id: I07ad88653e1b0a98ea80a6206890428de3f24865

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