Revert filtering unknown pods, as I believe that it is causing e2e flakes.

pkg/controller/replication_controller.go

@@ -179,8 +179,7 @@ func FilterActivePods(pods []api.Pod) []api.Pod {
 	var result []api.Pod
 	for _, value := range pods {
 		if api.PodSucceeded != value.Status.Phase &&
-			api.PodFailed != value.Status.Phase &&
-			api.PodUnknown != value.Status.Phase {
+			api.PodFailed != value.Status.Phase {
 			result = append(result, value)
 		}
 	}