auth: fix gosimple errors
auth: fix gosimple errors

CrazyJvm/etcd,joshix/etcd,vimalk78/etcd,lumjjb/etcd,ajityagaty/etcd,mickep76/etcd,visheshnp/etcd,mkumatag/etcd,akauppi/etcd,vimalk78/etcd,yudai/etcd,lorneli/etcd,armstrongli/etcd,armstrongli/etcd,plasticbox/etcd,cockroachdb/etcd,CrazyJvm/etcd,insequent/etcd,etcd-io/etcd,xiang90/etcd,rnaveiras/etcd,rchicoli/etcd,etcd-io/etcd,heyitsanthony/etcd,visheshnp/etcd,sinsharat/etcd,bdarnell/etcd,mqliang/etcd,mkumatag/etcd,qqsun8819/etcd,rnaveiras/etcd,tguangch/etcd,hongchaodeng/etcd,mickep76/etcd,bluebreezecf/etcd,rnaveiras/etcd,etcd-io/etcd,fanminshi/etcd,sebrandon1/etcd,mqliang/etcd,whuwxl/etcd,xiang90/etcd,gyuho/etcd,YuleiXiao/etcd,gyuho/etcd,dannysauer/etcd,coreos/etcd,li-ang/etcd,sinsharat/etcd,handsomesun/etcd,rchicoli/etcd,a-robinson/etcd,dannysauer/etcd,li-ang/etcd,coreos/etcd,ajityagaty/etcd,ravigadde/etcd,ravigadde/etcd,qqsun8819/etcd,mqliang/etcd,heyitsanthony/etcd,tguangch/etcd,akauppi/etcd,yudai/etcd,jlamillan/etcd,hongchaodeng/etcd,lumjjb/etcd,whuwxl/etcd,bdarnell/etcd,mkumatag/etcd,handsomesun/etcd,glevand/coreos--etcd,glevand/coreos--etcd,YuleiXiao/etcd,lorneli/etcd,insequent/etcd,bluebreezecf/etcd,joshix/etcd,plasticbox/etcd,cockroachdb/etcd,jlamillan/etcd,sebrandon1/etcd,fanminshi/etcd,a-robinson/etcd,ajityagaty/etcd