Enable flake8 E721
Enable flake8 E721

We already pass the test, so just remove from ignore list

Change-Id: I28bfeb99d9841532133a3825f7336e7b712d6561

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