CHANGELOG: update changelog-3.4
CHANGELOG: update changelog-3.4

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