Major Description
In some cases, when connecting to brokers, we end up calling selector.select() with the wrong timeout. Since 2.7, we should use a timeout computed from socket.connection.setup.timeout.ms to ensure we detect bad hosts quickly.
This is especially relevant now that client.dns.lookup defaults to use_all_dns_ips. In case, one of the IPs returned in currently unavailable, we want the client to quickly discover it and avoid timing out user calls.
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