[merge][0.11] run_bzr(working_dir='foo')

[John Arbash Meinel]

The attached patch adds 'working_dir' as parameters for most of the
run_bzr* functions (run_bzr, run_bzr_captured, run_bzr_subprocess,
start_bzr_subprocess).

It also cleans up test_selftest a little bit, because some tests were
added to the wrong base class. And tests that all parameters from
run_bzr get passed to run_bzr_captured.

Robert mentioned that he would like something like this. And since I've
been writing a few patches which could make use of it, I figured I would
implement it before I wrote too many more patches.

I'd like to get this in soon, so that I can start using it for new tests.

John
=:->
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