Messages get acked after reception, not delivery. This reduces unneeded retransmissions and storage at the sender side (https://issues.jboss.org/browse/JGRP-1664)
Added the kerberos 5 implementation the Martin Swales has contributed.

There was some changes to the original implementation that include the
renaming of the package of the added classes, replacement of the non-standard
base64 classes with standard versions and replacing the logging
mechanism with the jgroups specific version.
Merge branch 'master' of https://github.com/ccorsi/JGroups into JGRP-1657
First commit of Kerberos based authentication. Originally written by Martin Swales, added by Claudio Corsi (https://issues.jboss.org/browse/JGRP-1657)
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- Reading messages in 4 batches: messages tagges with INTERNAL *and* OOB
have mode=OOB in a batch but are processed by the internal pool (if
enabled) (https://issues.jboss.org/browse/JGRP-1665)
- Unit test to demonstrate https://issues.jboss.org/browse/JGRP-1665
added author tro kerb token
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JGRP-1491: When creating a view, the creator should be our own address