Remove deprecated config variables
Remove deprecated config variables

I1f8f5064ea8028af60f167df9b97e215cdadba44 deprecated auth_host etc but the default
config still used them.  Ieac26806bd420aa08fc79bbc6a11eb6a1c15c7df then switched
devstack to using the new variables, but if the old variables still existed in the
default config, some installations were broken (e.g. XenServer CI)

Partial-bug: 1415795

Change-Id: I7076fa03ab531cbb1114918f75113620b65590dc

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