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[BUGFIX] handle unsupported ApiVersionsRequest when channelPrepare #689
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fixes #688
Motivation
if enable sasl/plain, the apiVersionRequest request will fail when the client use higher than the Kafka-2.0 version protocol.
Modifications
Do special processing for unsupported ApiVersionsRequest like KafkaCommandDecoder's byteBufToRequest, and return UNSUPPORTED_VERSION error to the client.