Facter.clear clears all cached values and removes all facts from memory where Facter.flush just clears the cached values. This should reduce the time it takes to actually run the unit tests as it all the other facts we're touching won't be removed from memory. Also we only need to do it before the tests, not before and after. Change-Id: I9a24dc9f74cb3b59508b12e63a078068c26c1442