KAFKA-10292: Set min.insync.replicas to 1 of __consumer_offsets (#9286)
The test StreamsBrokerBounceTest.test_all_brokers_bounce() fails on 2.5 because in the last stage of the test there is only one broker left and the offset commit cannot succeed because the min.insync.replicas of __consumer_offsets is set to 2 and acks is set to all. This causes a time out and extends the closing of the Kafka Streams client to beyond the duration passed to the close method of the client. This affects especially the 2.5 branch since there Kafka Streams commits offsets for each task, i.e., close() needs to wait for the timeout for each task. In 2.6 and trunk the offset commit is done per thread, so close() does only need to wait for one time out per stream thread. I opened this PR on trunk, since the test could also become flaky on trunk and we want to avoid diverging system tests across branches. A more complete solution would be to improve the test by defining a better success criteria. Reviewers: Guozhang Wang <wangguoz@gmail.com>
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