Adds chunk_size to CompressingFileReader.
Adds chunk_size to CompressingFileReader.

Before when iterating using this object, the call to the underlying file object
was made without a chunk_size.  This is bad because this would cause the entire
contents of the file to be read.

Change-Id: I9956e5d2d693a6260252fff331d4f78f70179a6c

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