Add the __doc__ trick to the bottom of all the test modules.

This is so that http://fedmsg.com/en/latest/topics/ will have all the
appropriate docstrings.  Right now, it only has the ones from
tests/__init__.py.
Move that docs trick into a function.
PEP8/cosmetic while I'm here.
Add forgotten file.
Merge pull request #43 from fedora-infra/feature/docs-fix

Add the __doc__ trick to the bottom of all the test modules.