Make test_import_util.py independent of bootstrap_data.py.
Make test_import_util.py independent of bootstrap_data.py.

woodymit/millstone,churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone,woodymit/millstone,woodymit/millstone,churchlab/millstone,churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone_accidental_source,churchlab/millstone,woodymit/millstone_accidental_source