Fix a comment in bulk middleware.
Fix a comment in bulk middleware.

Change-Id: I3a65d090c5c6ce42639e0af0fcac738a12e52252

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