Fake api_versions for old brokers, rename to ApiVersionsRequest, and handle error decoding #2494
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Updates api_version handling so that versions are normalized against the list in kafka.protocol.broker_api_verisons, which includes copies of api_versions_response data from all brokers 0.10+ and synthetic responses for earlier brokers based on expected api availability. The broker_api_versions data is also used to provide api_versions data to the client when
api_versionis passed as configuration to avoid check_version() api calls.Also renames
ApiVersionRequest=>ApiVersionsRequestand moves fromkafka.protocol.admin=>kafka.protocol.api_versions.