[MERGE/RFC] 'bzr selftest --load bzrlib.tests.test_foo'

[John Arbash Meinel]

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On my Mac laptop, loading all of the test suite takes a significant
amount of time:

bzr selftest notestsmatchthingstriaoue
6.53s user 1.55s system 61% cpu 13.037 total

So it takes 13s just to find out there aren't any tests to run.

The attached patch adds a parameter to 'bzr selftest', which lets you
specify specific test files to load.

The difference is huge for me:
./bzr selftest --load bzrlib.tests.test_selftest notestsebaonetuha
0.50s user 0.66s system 82% cpu 1.407 total

I don't know if it is just my laptop, or if it is Apple, but being able
to run a subset and more importantly only have that subset loaded, makes
me a lot happier (especially when attempting to do TDD).

I'm not settled on the parameter name (--load). And it might be nice to
specify a path rather than a python path (bzrlib/tests/test_foo.py
rather than bzrlib.tests.test_foo), because bash can auto-complete them.

Another possibility would be to use the auto-loading code, and be able
to pass in a parameter that would let only load a module if it matched
the regex. So sort of like our existing regex match, only applied solely
to filenames.

I probably prefer that, but it depends on code that isn't approved, and
this was easy to write.

Thoughts and feedback are welcome.

John
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