clientv3: Fix URL to rpc errors
clientv3: Fix URL to rpc errors

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