enhance exception handling during transaction rollback
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                 Key: GERONIMO-4478
                 URL: https://issues.apache.org/jira/browse/GERONIMO-4478
             Project: Geronimo
          Issue Type: Improvement
      Security Level: public (Regular issues)
          Components: transaction manager
    Affects Versions: 2.2
            Reporter: Lin Sun
            Assignee: Lin Sun
             Fix For: 2.2


Currently, for any XAException arisen, we convert it to SystemException.  

1. If the exception is XAException.XA_HEURRB (which means transcation has been 
heuristically rolled back), we should not throw any exception as the resulting 
behavior is same as expected behavior.
2. JTA seems to assume that exceptions are not possible to be HEURMIX or 
HEURCOM or HEURHAZ (JTA doesn't define any heursitic exceptions thrown from the 
tm.rollback() method) so we'll just convert them to SystemException as it is 
today.

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