ISPN-4696 SuspectException kills operation on ClusterRegistryImpl

* Added retry for ClusterRegistry operations

https://issues.jboss.org/browse/ISPN-4696

Note this is only a stop gap solution for the time being since we do not know yet how we want to fully handle nodes leaving during a commit.  At least with the ClusterRegistry we know we can easily retry the command.
Yeah I will make sure those are done and do a better scan through to find any other dangling places for SuspectedException.  If we are propagating that exception it means our abstraction over JGroups is not working properly (although I don't think we could work without JGroups)