Code review comment for lp:~mvo/launchpad/support-timeframe-fix-660433

This update should create all the needed files locally now without the need to touch the network. Please note that I added a "class PoorMvosTestCase(unittest.TestCase)" that is used as a fallback if the full lp.testing import TestCase can not be imported. Feel free to remove it in the final merge (or I can remove it too once the rest looks ok). I added it because I only have a full LP environment in a VM and that is a bit of a hassle to work with. But this script really only needs the makeTemporaryFile feature. The test passes now for me without network and the data looks sane too.