Code review request: 8016051: Possible ClassCastException in KdcComm

[Artem Smotrakov]

Hi,

please review this fix for 8:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8016051
http://1.smotrakov.z8.ru/8016051/webrev.00/

It fixes a possible ClassCastException if an exception thrown from 
send() method is not IOException or KrbException. The first exception is 
thrown if all connections to KDC fail. See also:

http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-June/017714.html

Artem
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