Update UtilsTest to reflect new restart behavior
Update UtilsTest to reflect new restart behavior

Again, this only changes the restart behavior if the user specifically
requests clean=never, and the only work duplicated on a restart of a
completed workflow will be the exports. So removing these asserts
doesn't reflect that anything is broken, just that expectations have
changed.

BD2KGenomics/slugflow,BD2KGenomics/slugflow