[MERGE] Include formatted traceback in SmartMessageHandlerError details.

[John Arbash Meinel]

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Andrew Bennetts wrote:
> 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.
> 
> 

This only effects debugging right? Otherwise I would think that seeing a
formatted traceback as part of an already formatted traceback would be a
bit weird.

Also, shouldn't there be a test in bzrlib/tests/test_errors.py that
needs updating?

BB:tweak

John
=:->

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