Make test failure message clearer

Author: acogoluegnes

src/test/java/com/rabbitmq/client/test/server/TopicPermissions.java

@@ -93,7 +93,7 @@ void assertAccessOk(String description, Callable<Void> action) {
         try {
             action.call();
         } catch(Exception e) {
-            fail(description + "(" + e.getMessage()+")");
+            fail(description + " (" + e.getMessage()+")");
         }
     }