UnifiedInvokerHAProxy.invoke() only calls invocationHasReachedAServer(Invocation invocation)
if GenericClusteringException is received and the exception is not GenericClusteringException.COMPLETED_NO

This is not correct because invocationHasReachedAServer(Invocation invocation) needs to be called on
successful returns as well. If we don't, the code never remembers that a call within a transaction was
successful and therefore, never adds the potential transaction (with JBAS-4455, this will transaction propagation context)
associated with the call to the failover map authorisations.

Example:
- ok call 1 within tx1
- ok call 2 within tx1
- ok call 3 within tx1
- fail call 4 with GenericClusteringException.COMPLETED_NO

None of the successfull calls updated the map, so when the 4 call occurs, txContextAllowsFailover(invocation) is called, but
the map is empty, so would allow failover when it shouldn't. A transaction reached the server already in any of the previous
calls associated with that transaction.

JRMPInvokerProxyHA does not have this issue.