We have some redundant tests for producer.
1. Tests in LazyInitProducerTest are redundant from those in PrimitiveApiTest.
2. AsyncProducerTest.testBrokerListAndAsync() just returns immediately. There are other tests that cover the same functionality.
3. PrimitiveApiTest: The compression property wasn't set properly. Also, there is no need to test compression with other combinations such as encoder/multi-fetch.