auth: unit-test for authStore.AuthDisable()
auth: unit-test for authStore.AuthDisable()

This will cover unit-test for AuthDisable in store.go

gyuho/etcd,CrazyJvm/etcd,sebrandon1/etcd,lumjjb/etcd,lorneli/etcd,glevand/coreos--etcd,plasticbox/etcd,jlamillan/etcd,visheshnp/etcd,mqliang/etcd,sinsharat/etcd,bluebreezecf/etcd,fanminshi/etcd,yudai/etcd,rnaveiras/etcd,bdarnell/etcd,vimalk78/etcd,yudai/etcd,CrazyJvm/etcd,li-ang/etcd,mqliang/etcd,etcd-io/etcd,lorneli/etcd,bluebreezecf/etcd,etcd-io/etcd,rnaveiras/etcd,insequent/etcd,a-robinson/etcd,jlamillan/etcd,bdarnell/etcd,ajityagaty/etcd,coreos/etcd,heyitsanthony/etcd,heyitsanthony/etcd,akauppi/etcd,dannysauer/etcd,dannysauer/etcd,mkumatag/etcd,coreos/etcd,xiang90/etcd,YuleiXiao/etcd,sinsharat/etcd,sebrandon1/etcd,handsomesun/etcd,mkumatag/etcd,xiang90/etcd,fanminshi/etcd,YuleiXiao/etcd,etcd-io/etcd,insequent/etcd,vimalk78/etcd,a-robinson/etcd,whuwxl/etcd,gyuho/etcd,plasticbox/etcd,whuwxl/etcd,li-ang/etcd,armstrongli/etcd,visheshnp/etcd,tguangch/etcd,joshix/etcd,ajityagaty/etcd,lumjjb/etcd,armstrongli/etcd,cockroachdb/etcd,glevand/coreos--etcd,mickep76/etcd,cockroachdb/etcd,rnaveiras/etcd,joshix/etcd,mickep76/etcd,ajityagaty/etcd,mkumatag/etcd,mqliang/etcd,tguangch/etcd,handsomesun/etcd,akauppi/etcd