beam/data: prettier Message.Pretty()

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Upstream-commit: c9b8e0fcac0674ec1a1387c40281a905ce351300
Component: engine

components/engine/pkg/beam/data/message.go

@@ -65,7 +65,7 @@ func (m Message) Pretty() string {
 	for k, values := range data {
 		entries = append(entries, fmt.Sprintf("%s=%s", k, strings.Join(values, ",")))
 	}
-	return strings.Join(entries, "\n")
+	return strings.Join(entries, " ")
 }
 
 func (m Message) String() string {