orphan e2e test should fail if timeout

test/e2e/garbage_collector.go

@@ -210,7 +210,7 @@ var _ = framework.KubeDescribe("Garbage collector", func() {
 				return false, nil
 			}
 			return true, nil
-		}); err != nil && err != wait.ErrWaitTimeout {
+		}); err != nil {
 			framework.Failf("%v", err)
 		}
 		By("wait for 30 seconds to see if the garbage collector mistakenly deletes the pods")