[MERGE] Include formatted traceback in SmartMessageHandlerError details.

[Andrew Bennetts]

This is just a simple patch to extend SmartMessageHandlerError a little.
I've found it very helpful when debugging my work on adding a
VersionedFiles.insert_record_stream RPC.

This would also help with diagnosing bugs like
<https://bugs.launchpad.net/bzr/+bug/304544>.

-Andrew.

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