functional tests: compatibility fix for Python 2.7 and unittest2.
functional tests: compatibility fix for Python 2.7 and unittest2.

I'm not specially happy to call `_wrapped_run` which is explicitly flagged as part of "private methods" in the code, but I couldn't come up with a cleaner alternative.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@9831 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac