Revert "suggest fallocate instead of dd in saio"
Revert "suggest fallocate instead of dd in saio"

Change-Id: I3742c4580d920e09de434e86b75b134c62f1732e

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