message: Fix another failure caused by compat horizon being moved forward
  This time, the existing test didn't check date at all. As expected this quickly resulted in test job failure
diff: @@ -164,9 +164,9 @@ class TrtConvertTest(test_util.TensorFlowTestCase):
  "v1": "Const",
  "add/ReadVariableOp": "Identity",
  "input": "Placeholder",
  - "add": "Add",
  + "add": "AddV2",
  "mul": "Mul",
  - "add_1": "Add",
  + "add_1": "AddV2",
  "output": "Identity"
  }, node_name_to_op)
  return graph_def
  @@ -407,9 +407,9 @@ class TrtConvertTest(test_util.TensorFlowTestCase):
  {
  "add/ReadVariableOp": "Const",
  "input": "Placeholder",
  - "add": "Add",
  + "add": "AddV2",
  "mul": "Mul",
  - "add_1": "Add",
  + "add_1": "AddV2",
  "output": "Identity"
  }, node_name_to_op)
  