'Store base swap images for later examination.'

def _store_swap_image(self, ent):

    names = ent.split('_')
    if ((len(names) == 2) and (names[0] == 'swap')):
        if ((len(names[1]) > 0) and names[1].isdigit()):
            LOG.debug('Adding    %s    into    backend    swap    images', ent)
            self.back_swap_images.add(ent)
