Fix up dracut module non-hostonly mode behavior
    
    Grabbed from bz comment by Doug, with an follow-up off-list fix to the
    test for uverbs0 existing (it's a character device, not a directory).
    
    Signed-off-by: Jarod Wilson <jarod@redhat.com>
    Signed-off-by: Doug Ledford <dledford@redhat.com>