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We should support kafka-node for IPv6 as well. I've updated the parseHost function to parse both IPv4 and IPv6 addresses. According to RFC 3986 (https://tools.ietf.org/html/rfc3986), an IPv6 address is supposed to be wrapped by brackets and separated with port number by a colon.
eg. [2001:bd4:32:4d21:225d:1f22:113:2535]:9092
This an example of presented IPv6 address a client is supposed to receive as the kafkaHost option.