Improvement of loop device cleanup and disabling of image-backed tests are so we can start
running the test suite in jenkins again, @clumens.
The device factory tests fail without the changes from #182. They increase coverage of
devicefactory.py from 19% to 74% (IIRC).
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/183