docs: def delete_deps(self, conf, images):
          """Delete any deleteable images"""
          for dependency_name, _ in conf.dependency_images():
              image = images[dependency_name]
              if image.deleteable_image:
                  log.info("Removing un-needed image {0}".format(image.image_name))
                  conf.harpoon.docker_api.remove_image(image.image_name)