KAFKA-922 System Test - set retry.backoff.ms=300 to testcase_0119; reviewed by Neha Narkhede
kafka-900; ClosedByInterruptException when high-level consumer shutdown normally; patched by Jun Rao; reviewed by Neha Narkhede
kafka-649; Cleanup log4j logging (extra); patched by Jun Rao; reviewed by Neha Narkhede
KAFKA-923 Improve controller failover latency. Remove unnecessary zookeeper reads; reviewed by Jun Rao