Add support for brokers separating external and internal traffic (introduced in KIP-103) #860
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Fixes point 1 of Issue #859
Checks if the
listener.security.protocol.map
property is present in the broker metadata. If it is: it will apply the mapping from listener name to security protocol used before checking whether a listener uses the protocol desired by the kafka-node client.For point 2 it currently still requires the endpoint to be used by kafka-node to be listed first.