DRILL-6625: Intermittent failures in Kafka unit tests Unit test changes to fix intermittent kafka producer and consumer errors. - Increase the value of REQUEST_TIMEOUT_MS_CONFIG to accomadate slower systems. - Increase the value of producer RETRIES_CONFIG to 3 (from 0). - Prevent producer to send duplicate messages due to retries by enabling Idempotent producer. - Increase consumer poll timeout (from 200 ms).
- Current behavior is surefire runs test classes twice - once as a part of `TestKafkaSuit` and the other by directly running classes. To prevent the latter from happening, changes were made in `pom.xml` for `storage-mongo` plugin.