Add auth_version to dispersion.conf.5
Add auth_version to dispersion.conf.5

The lack of any documentation for the auth_version was observed
by Red Hat QA, see rhbz#955247.

Change-Id: I0afc04d848082a80480724bdbf99031e4b99e38e

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