replace a value set with utils.TRUE_VALUES
replace a value set with utils.TRUE_VALUES

replace a value set with utils.TRUE_VALUES, and fix some pep8 issues

Change-Id: If4db41d0d538afddee0d78449d229ce319c5efba

clayg/swift,hbhdytf/mac,maginatics/swift,levythu/swift,notmyname/swift,psachin/swift,mjwtom/swift,hbhdytf/mac2,matthewoliver/swift,redhat-openstack/swift,hbhdytf/mac2,JioCloud/swift,VictorLowther/swift,williamthegrey/swift,clayg/swift,citrix-openstack-build/swift,wenhuizhang/swift,bkolli/swift,hurricanerix/swift,smerritt/swift,swiftstack/swift,notmyname/swift,takeshineshiro/swift,hbhdytf/mac,matthewoliver/swift,tipabu/swift,Akanoa/swift,Triv90/SwiftUml,wenhuizhang/swift,shibaniahegde/OpenStak_swift,prashanthpai/swift,mjzmjz/swift,redbo/swift,Khushbu27/Tutorial,hurricanerix/swift,tsli/test,scality/ScalitySproxydSwift,Mirantis/swift-encrypt,IPVL/swift-kilo,shibaniahegde/OpenStak_swift,matthewoliver/swift,xiaoguoai/ec-dev-swift,daasbank/swift,tipabu/swift,Khushbu27/Tutorial,VictorLowther/swift,anishnarang/gswift,bradleypj823/swift,bouncestorage/swift,NeCTAR-RC/swift,iostackproject/IO-Bandwidth-Differentiation,bradleypj823/swift,nadeemsyed/swift,notmyname/swift,smerritt/swift,notmyname/swift,hurricanerix/swift,maginatics/swift,tipabu/swift,dencaval/swift,Em-Pan/swift,smerritt/swift,xiaoguoai/ec-dev-swift,redhat-openstack/swift,thiagodasilva/swift,swiftstack/swift,aerwin3/swift,hurricanerix/swift,gold3bear/swift,iostackproject/IO-Bandwidth-Differentiation,tsli/test,gold3bear/swift,swiftstack/swift,redbo/swift,openstack/swift,eatbyte/Swift,Em-Pan/swift,clayg/swift,mjwtom/swift,zackmdavis/swift,anishnarang/gswift,bkolli/swift,scality/ScalitySproxydSwift,psachin/swift,citrix-openstack/build-swift,rackerlabs/swift,hbhdytf/mac2,matthewoliver/swift,IPVL/swift-kilo,orion/swift-config,hbhdytf/mac2,Seagate/swift,openstack/swift,larsbutler/swift,clayg/swift,tipabu/swift,citrix-openstack/build-swift,dpgoetz/swift,psachin/swift,sarvesh-ranjan/swift,NeCTAR-RC/swift,aerwin3/swift,rackerlabs/swift,takeshineshiro/swift,zaitcev/swift-lfs,nadeemsyed/swift,Triv90/SwiftUml,levythu/swift,Akanoa/swift,dpgoetz/swift,prashanthpai/swift,larsbutler/swift,sarvesh-ranjan/swift,orion/swift-config,openstack/swift,JioCloud/swift,Seagate/swift,Mirantis/swift-encrypt,williamthegrey/swift,revoer/keystone-8.0.0,smerritt/swift,dencaval/swift,psachin/swift,AfonsoFGarcia/swift,nadeemsyed/swift,revoer/keystone-8.0.0,zaitcev/swift-lfs,openstack/swift,AfonsoFGarcia/swift,thiagodasilva/swift,daasbank/swift,mjzmjz/swift,eatbyte/Swift,zackmdavis/swift,citrix-openstack-build/swift,bouncestorage/swift,nadeemsyed/swift