Code review comment for lp:~jml/launchpad/import-fascist-tweaks

This branch does a few different things, all to do with the import fascist. The patch:
  * restructures the logic to be a bit clearer.
  * provides a data-driven approach for allowing imports that aren't in __all__
  * makes importfascist check packages in 'lp' and not just 'canonical'
  * stops the warnings that we were all getting when running the tests
  * fixes a whole bunch of warnings that we weren't getting because of 'lp' being ignored
  * cleans up random pyflakes

Merry Christmas