* Add integration test for transactional kafka
* Add true for transactions enabled for transactional test
* Add new test to travis_script_integration.sh, use version 0.2 of druid docker image
* Use different datasource name for ITKafkaIndexingServiceTest and ITKafkaIndexingServiceTransactionalTest
* use KafkaConsumerConfigs to get common consumer properties
* Remove double line breaks
* remove extra space