Update unit tests for download.py, repository_lib.py, repository_tool.py, and updater.py.
Re-generate repository data so that compressed metadata may be tested.
Added two switches to the generate script:
-k (or --keys), which forces the creation of new keys.
-d (or --dry-run), which skips the actual writing or copying phases
The second option might be useful in the future, and helped me debug the
optparse module, so I left it there.
