Support for read-only transaction in xa resource proxy

generic jms ra has a proxy for the XA resource participating in an XA
transaction. the proxy controls the transaction state changes in the actual xa
resource.
So the actual state change may not be propagated back to the resource always. In
case of a read-only transactions, the behavior of the Resource proxy needs to be
verified. In case of read-only transaction prepare or commit may not be called
on the transaction (depending on whethere there is 1 or more resources in the
transaction). This situation has to be accounted in the resource proxy,
especially during redelivery when the start of a transaction is delayed until
prepare is called.
#### Environment
Operating System: All
Platform: Sun
#### Affected Versions
[v1.6]