KAFKA-4245: Don't swallow IOExceptions #1948
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Remove swallowing of exceptions from BlockingChannel#connect.
This commit also slightly reworks the handling of a
BlockingChannel in KafkaServer to correctly handle the possibility
of an IOException being thrown by BlockingChannel#connect().
Note that I'm totally new to Scala, so any advice on anything I might
be doing here that is unconventional or just plain wrong is
certainly welcome.