[bzr-usertest:MERGE] Fix exit_codes handling in bzr-usertest

[Andrew Bennetts]

Here's a fix to the way bzr-usertest handles exit codes.  I've attached the
merge directive, and registered a merge proposal on Launchpad:

<https://code.launchpad.net/~spiv/bzr-usertest/exit_codes/+merge/1309>

-Andrew.

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