Send only info log for CloseNotify #182
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According the RFC 5246 section 7.2 (https://tools.ietf.org/html/rfc5246#section-7.2), CloseNotify is a normal alert that notifies that the connection is being closed. Setting this to
warn!makes it appear fairly often in end programs, but serves no actual "warning". This PR changes the CloseNotify log level toinfo!.