Print the output from RBE bootstrap shutdown am: 91a46d0ef4 am: 1f3a7f6ccf

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/14371203

Change-Id: I7d8dd627fd0e93c2ae1a48bb635beb06089dd80a

ui/build/rbe.go

@@ -87,9 +87,15 @@ func startRBE(ctx Context, config Config) {
 
 func stopRBE(ctx Context, config Config) {
 	cmd := Command(ctx, config, "stopRBE bootstrap", rbeCommand(ctx, config, bootstrapCmd), "-shutdown")
-	if output, err := cmd.CombinedOutput(); err != nil {
+	output, err := cmd.CombinedOutput()
+	if err != nil {
 		ctx.Fatalf("rbe bootstrap with shutdown failed with: %v\n%s\n", err, output)
 	}
+
+	if len(output) > 0 {
+		fmt.Fprintln(ctx.Writer, "")
+		fmt.Fprintln(ctx.Writer, fmt.Sprintf("%s", output))
+	}
 }
 
 // DumpRBEMetrics creates a metrics protobuf file containing RBE related metrics.