embed: reject binding listeners to domain names
embed: reject binding listeners to domain names

Fixes #6336

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