message: Fix pylint in kafka implementation
diff: @@ -18,17 +18,18 @@ from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  +from tensorflow.python.platform import test
  +
  from tensorflow_io.kafka.python.ops import kafka_dataset_ops
  from tensorflow.python.data.ops import iterator_ops
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.ops import array_ops
  -from tensorflow.python.platform import test
  class KafkaDatasetTest(test.TestCase):
  + """Tests for KafkaDataset."""
  - def setUp(self):
  # The Kafka server has to be setup before the test
  # and tear down after the test manually.
  # The docker engine has to be installed.
  @@ -38,9 +39,9 @@ class KafkaDatasetTest(test.TestCase):
  #
  # To team down the Kafka server:
  # $ bash kafka_test.sh stop kafka
  - pass
  - def testKafkaDataset(self):
  + def test_kafka_dataset(self):
  + """Tests for KafkaDataset."""
  topics = array_ops.placeholder(dtypes.string, shape=[None])
  num_epochs = array_ops.placeholder(dtypes.int64, shape=[])
  batch_size = array_ops.placeholder(dtypes.int64, shape=[])
  