Rebalacne for producer connector on broker list change.
Testing rebalance on consumer broker connection failure.
Merge branch 'master' into develop

Conflicts:
	src/Kafka/IMetadata.php
	src/Kafka/ProducerConnector.php
	src/Kafka/V07/Metadata.php
	tests/Kafka/V07/ProducerChannelTest.php
Merge branch 'develop' of git:kafka-php into develop
ConsumerConnector zk register groupId an processId