slapos-buildout should not depend of simplejson.

src/zc/buildout/networkcache.py

@@ -18,7 +18,6 @@ import urllib
 import posixpath
 import base64
 import hashlib
-import json
 
 
 def _get_hash_from_file(path, hash_object):
@@ -87,7 +86,7 @@ def get_sha256sum_from_networkcached(network_cache, url, logger):
     try:
         result = urllib.urlopen(network_cached_url)
         if int(result.code) == 200:
-          return json.loads(result.read().strip()).get('sha256sum', None)
+          return result.read().strip()
         logger.info('The url is not cached yet: %s' % url)
     except IOError, e:
         logger.info('An error occurred to get sha256sum of url %s. %s' % \