def clean(self, stall_time=None):
        self.reap_invalid()

        if stall_time is None:
            stall_time = self.conf.image_cache_stall_time

        self.reap_stalled(stall_time)
Delete any image files in the invalid directory and any
dataset/ETHPy150Open rcbops/glance-buildpackage/glance/image_cache/drivers/xattr.py/Driver.clean