sync mode for KafkaProducerMH
Fixes: GH-125 (https://github.com/spring-projects/spring-integration-kafka/issues/125) * Add `sync` mode for the `KafkaProducerMessageHandler` (`false` by default) to wait for result from the send `Future` * Add `sendTimeout` do not block `Future.get()` forever * Provide test-case based on the `MockProducer` to complete the record with an exception and verify that the `sync` mode works well * Some dependencies upgrade Wrap `Future.get()` `TimeoutException` into `MessageTimeoutException` Fix whitespace after comma
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