message: rename interleave test
diff: @@ -374,7 +374,7 @@ class InterleaveDatasetCheckpointTest(checkpoint_test_base.CheckpointTestBase,
  cycle_length=2,
  block_length=[1, 3],
  num_parallel_calls=[None, 1, 2])))
  - def testSerializationCore(self, cycle_length, block_length,
  + def testCore(self, cycle_length, block_length,
  num_parallel_calls):
  input_values = np.array([4, 5, 6], dtype=np.int64)
  num_outputs = np.sum(input_values) * 2
  