CHANGELOG: update CHANGELOG-3.4 from #10646
CHANGELOG: update CHANGELOG-3.4 from #10646

mqliang/etcd,etcd-io/etcd,mkumatag/etcd,mkumatag/etcd,dannysauer/etcd,ajityagaty/etcd,ajityagaty/etcd,etcd-io/etcd,coreos/etcd,rnaveiras/etcd,rnaveiras/etcd,li-ang/etcd,mqliang/etcd,cockroachdb/etcd,etcd-io/etcd,ajityagaty/etcd,coreos/etcd,gyuho/etcd,rnaveiras/etcd,mqliang/etcd,li-ang/etcd,gyuho/etcd,dannysauer/etcd,mkumatag/etcd,cockroachdb/etcd