[KAFKA-7780] Kafka client should validate topic-level configs and update only unique values #6088
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User Interface Improvement : Kafka client should validate topic-level configs, and throw exception in case of invalid (duplicate) config values.
Example: ./kafka-topics.sh --create --topic test --partitions 2 --replication-factor 1 --zookeeper localhost:2181 --config cleanup.policy=delete,compact,delete
should throw exception like
Invalid value delete,compact,delete for configuration cleanup.policy: Contains duplicate values
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