Require a KubeletClient in master.New().

Without this, tests which create a master
will panic with a nil pointer when the periodic
podCache update runs.

Deleted unused FakePodInfoGetter.
Added FakeKubeletClient.
Passed to master.New.
Required a KubeletClient in master.New.

test/integration/client_test.go

@@ -41,6 +41,7 @@ func TestClient(t *testing.T) {
 	}
 	m := master.New(&master.Config{
 		EtcdHelper:        helper,
+		KubeletClient:     client.FakeKubeletClient{},
 		EnableLogsSupport: false,
 		EnableUISupport:   false,
 		APIPrefix:         "/api",