Remove cros-unzip.py because `python -m zipfile -e ARCHIVE TARGET` do the work

cros-unzip.py

-#!/usr/bin/env python2
-# -*- coding: utf-8 -*-
-"""
-  Extracts files from a .zip container to the current working directory.
-
-  http://stackoverflow.com/questions/7806563/how-to-unzip-a-file-with-python-2-4
-"""
-import sys
-import zipfile
-zfile = zipfile.ZipFile(sys.argv[1])  # Usage: unzip ZIPFILE
-zfile.extractall(".")
-zfile.close()