Fix pep8 error in bin/nova-manage
Fix pep8 error in bin/nova-manage

Also remove unused imports.

Change-Id: I6a5379ef9493fe39ba9442e809d0aeeaa97fb7b1

sebrandon1/nova,gooddata/openstack-nova,vladikr/nova_drafts,apporc/nova,aristanetworks/arista-ovs-nova,maheshp/novatest,mgagne/nova,j-carpentier/nova,saleemjaveds/https-github.com-openstack-nova,JioCloud/nova,dstroppa/openstack-smartos-nova-grizzly,plumgrid/plumgrid-nova,mahak/nova,Francis-Liu/animated-broccoli,apporc/nova,mandeepdhami/nova,Yuriy-Leonov/nova,j-carpentier/nova,petrutlucian94/nova,jeffrey4l/nova,isyippee/nova,cloudbase/nova-virtualbox,SUSE-Cloud/nova,dawnpower/nova,eayunstack/nova,petrutlucian94/nova,dstroppa/openstack-smartos-nova-grizzly,alvarolopez/nova,Juniper/nova,sebrandon1/nova,alaski/nova,whitepages/nova,maelnor/nova,barnsnake351/nova,tudorvio/nova,vladikr/nova_drafts,cyx1231st/nova,OpenAcademy-OpenStack/nova-scheduler,cloudbau/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,joker946/nova,virtualopensystems/nova,DirectXMan12/nova-hacking,rrader/nova-docker-plugin,zhimin711/nova,aristanetworks/arista-ovs-nova,JioCloud/nova_test_latest,nikesh-mahalka/nova,rajalokan/nova,bgxavier/nova,Triv90/Nova,maheshp/novatest,sridevikoushik31/openstack,varunarya10/nova_test_latest,cloudbase/nova,OpenAcademy-OpenStack/nova-scheduler,sridevikoushik31/nova,LoHChina/nova,viggates/nova,shahar-stratoscale/nova,rickerc/nova_audit,DirectXMan12/nova-hacking,ntt-sic/nova,fnordahl/nova,fajoy/nova,tangfeixiong/nova,CloudServer/nova,Juniper/nova,devendermishrajio/nova,zzicewind/nova,rajalokan/nova,Yusuke1987/openstack_template,berrange/nova,alexandrucoman/vbox-nova-driver,luogangyi/bcec-nova,sacharya/nova,openstack/nova,Tehsmash/nova,badock/nova,noironetworks/nova,orbitfp7/nova,thomasem/nova,yrobla/nova,yrobla/nova,phenoxim/nova,cyx1231st/nova,scripnichenko/nova,gspilio/nova,cernops/nova,spring-week-topos/nova-week,devoid/nova,ruslanloman/nova,CEG-FYP-OpenStack/scheduler,varunarya10/nova_test_latest,vmturbo/nova,badock/nova,alaski/nova,eharney/nova,Stavitsky/nova,iuliat/nova,sridevikoushik31/openstack,berrange/nova,Stavitsky/nova,Metaswitch/calico-nova,CEG-FYP-OpenStack/scheduler,affo/nova,klmitch/nova,akash1808/nova_test_latest,luogangyi/bcec-nova,JioCloud/nova,maoy/zknova,hanlind/nova,yosshy/nova,rrader/nova-docker-plugin,double12gzh/nova,tudorvio/nova,ntt-sic/nova,rickerc/nova_audit,silenceli/nova,scripnichenko/nova,belmiromoreira/nova,citrix-openstack-build/nova,eonpatapon/nova,jianghuaw/nova,NeCTAR-RC/nova,joker946/nova,mmnelemane/nova,bgxavier/nova,BeyondTheClouds/nova,kimjaejoong/nova,tangfeixiong/nova,leilihh/novaha,mmnelemane/nova,takeshineshiro/nova,affo/nova,eonpatapon/nova,tealover/nova,petrutlucian94/nova_dev,JianyuWang/nova,akash1808/nova,vmturbo/nova,jeffrey4l/nova,maelnor/nova,mgagne/nova,jianghuaw/nova,gooddata/openstack-nova,TwinkleChawla/nova,dims/nova,mahak/nova,barnsnake351/nova,maoy/zknova,houshengbo/nova_vmware_compute_driver,MountainWei/nova,alexandrucoman/vbox-nova-driver,viggates/nova,gspilio/nova,shootstar/novatest,ruslanloman/nova,ewindisch/nova,yatinkumbhare/openstack-nova,imsplitbit/nova,NeCTAR-RC/nova,zzicewind/nova,Juniper/nova,sridevikoushik31/openstack,TieWei/nova,rahulunair/nova,watonyweng/nova,projectcalico/calico-nova,shail2810/nova,vmturbo/nova,Yuriy-Leonov/nova,ted-gould/nova,shail2810/nova,rajalokan/nova,orbitfp7/nova,openstack/nova,dawnpower/nova,TieWei/nova,zaina/nova,phenoxim/nova,thomasem/nova,takeshineshiro/nova,shootstar/novatest,TwinkleChawla/nova,adelina-t/nova,qwefi/nova,felixma/nova,adelina-t/nova,gooddata/openstack-nova,imsplitbit/nova,Juniper/nova,Metaswitch/calico-nova,klmitch/nova,leilihh/nova,maoy/zknova,mikalstill/nova,zhimin711/nova,kimjaejoong/nova,alvarolopez/nova,tianweizhang/nova,tanglei528/nova,Francis-Liu/animated-broccoli,devendermishrajio/nova,leilihh/nova,plumgrid/plumgrid-nova,fnordahl/nova,iuliat/nova,dstroppa/openstack-smartos-nova-grizzly,BeyondTheClouds/nova,LoHChina/nova,sridevikoushik31/nova,spring-week-topos/nova-week,DirectXMan12/nova-hacking,saleemjaveds/https-github.com-openstack-nova,whitepages/nova,watonyweng/nova,JianyuWang/nova,cernops/nova,tianweizhang/nova,noironetworks/nova,leilihh/novaha,angdraug/nova,jianghuaw/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,felixma/nova,edulramirez/nova,Triv90/Nova,raildo/nova,fajoy/nova,rahulunair/nova,maheshp/novatest,blueboxgroup/nova,cernops/nova,shahar-stratoscale/nova,sridevikoushik31/nova,ewindisch/nova,redhat-openstack/nova,MountainWei/nova,virtualopensystems/nova,akash1808/nova_test_latest,klmitch/nova,raildo/nova,redhat-openstack/nova,eayunstack/nova,eharney/nova,Yusuke1987/openstack_template,houshengbo/nova_vmware_compute_driver,cloudbase/nova-virtualbox,devendermishrajio/nova_test_latest,sridevikoushik31/nova,blueboxgroup/nova,bigswitch/nova,BeyondTheClouds/nova,mahak/nova,sebrandon1/nova,double12gzh/nova,bclau/nova,tealover/nova,mikalstill/nova,ted-gould/nova,mikalstill/nova,akash1808/nova,fajoy/nova,openstack/nova,edulramirez/nova,JioCloud/nova_test_latest,cloudbau/nova,SUSE-Cloud/nova,hanlind/nova,houshengbo/nova_vmware_compute_driver,klmitch/nova,Triv90/Nova,cloudbase/nova,vmturbo/nova,nikesh-mahalka/nova,sacharya/nova,citrix-openstack-build/nova,bclau/nova,cloudbase/nova,CloudServer/nova,belmiromoreira/nova,gooddata/openstack-nova,mandeepdhami/nova,CiscoSystems/nova,tanglei528/nova,bigswitch/nova,zaina/nova,projectcalico/calico-nova,CCI-MOC/nova,devoid/nova,silenceli/nova,Tehsmash/nova,gspilio/nova,rajalokan/nova,yatinkumbhare/openstack-nova,petrutlucian94/nova_dev,rahulunair/nova,qwefi/nova,yosshy/nova,CCI-MOC/nova,isyippee/nova,angdraug/nova,yrobla/nova,dims/nova,CiscoSystems/nova,devendermishrajio/nova_test_latest,hanlind/nova,jianghuaw/nova,aristanetworks/arista-ovs-nova