mounttable cmd:  Change success message for Unmount.

Change-Id: Ie1bc0a90425bf864178f0a875cfb6333042e9519
diff --git a/tools/mounttable/impl.go b/tools/mounttable/impl.go
index 694d8bc..5b66223 100644
--- a/tools/mounttable/impl.go
+++ b/tools/mounttable/impl.go
@@ -151,7 +151,7 @@
 	if err := call.Finish(); err != nil {
 		return err
 	}
-	fmt.Fprintln(cmd.Stdout(), "Name unmounted successfully.")
+	fmt.Fprintln(cmd.Stdout(), "Unmount successful or name not mounted.")
 	return nil
 }