kafka-1400; transient unit test failure in SocketServerTest; patched by Neha Narkhede; reviewed by Guozhang and Jun Rao
kafka-1433; transient unit test failure in ZookeeperConsumerConnectorTest; patched by Jun Rao; reviewed by Guozhang Wang
KAFKA-1425; Expose metric for LogStartOffset; reviewed by Joel Koshy and Jun Rao
kafka-1412; transient unit test failure in ProducerSendTest.testAutoCreateTopic; patched by Jun Rao; reviewed by Guozhang Wang and Neha Narkhede