Make the IDs in the test DB the proper length.

initdb.py

@@ -26,14 +26,14 @@ REFERENCE_DATE = datetime(2013, 6, 23)
 
 def __gen_checksum(image_id):
   h = hashlib.md5(image_id)
-  return 'tarsum+sha256:' + h.hexdigest()
+  return 'tarsum+sha256:' + h.hexdigest() + h.hexdigest()
 
 
 def __gen_image_id(repo, image_num):
   str_to_hash = "%s/%s/%s" % (repo.namespace, repo.name, image_num)
 
   h = hashlib.md5(str_to_hash)
-  return h.hexdigest()
+  return h.hexdigest() + h.hexdigest()
 
 
 global_image_num = [0]