veyron.io/veyron/veyron/tools/namespace: Outputs result errors from Glob,
if any.

Change-Id: I1282ca0ceb5d4148f505e8f2dc63f2640a29c412
diff --git a/tools/namespace/impl.go b/tools/namespace/impl.go
index 5af02db..b4c1e03 100644
--- a/tools/namespace/impl.go
+++ b/tools/namespace/impl.go
@@ -39,6 +39,10 @@
 		for _, s := range res.Servers {
 			fmt.Fprintf(cmd.Stdout(), " %s (Expires %s)", s.Server, s.Expires)
 		}
+		if res.Error != nil {
+			fmt.Fprintln(cmd.Stdout())
+			fmt.Fprintf(cmd.Stdout(), "result error: %v", res.Error)
+		}
 		fmt.Fprintln(cmd.Stdout())
 	}
 	return nil