kubenet: Fix host port for rktnetes.

Because rkt pod runs after plugin.SetUpPod() is called, so
getRunningPods() does not return the newly created pod, which
causes the hostport iptable rules to be missing for this new pod.

pkg/kubelet/network/hostport/hostport_test.go

@@ -185,7 +185,7 @@ func TestOpenPodHostports(t *testing.T) {
 		})
 	}
 
-	err := h.OpenPodHostportsAndSync(tests[0].pod, "br0", runningPods)
+	err := h.OpenPodHostportsAndSync(&RunningPod{Pod: tests[0].pod, IP: net.ParseIP(tests[0].ip)}, "br0", runningPods)
 	if err != nil {
 		t.Fatalf("Failed to OpenPodHostportsAndSync: %v", err)
 	}