[FLINK-7739] [kafka connector] Fix test instabilities
- Set shorter heartbeats intervals. Default pause value of 60seconds is too large (tests would timeout before akka react) - Exclude netty dependency from zookeeper. Zookeeper was pulling in conflicting Netty version. Conflict was extremly subtle - TaskManager in Kafka tests was deadlocking in some rare corner cases. This closes #4775
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