beam/data: Message.Bytes() convenience method

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)

pkg/beam/data/message.go

@@ -45,3 +45,7 @@ func (m Message) Del(k string) Message {
 func (m Message) String() string {
 	return string(m)
 }
+
+func (m Message) Bytes() []byte {
+	return []byte(m)
+}