Symlink test_env.py instead of test_support in preparation of jinja2.

appengine/components/components/auth/model_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Swarming Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 import datetime
 import sys
 import unittest
 
-from test_support import test_env
+import test_env
 test_env.setup_test_env()
 
 from google.appengine.ext import ndb
 
 from components import utils
 from components.auth import ipaddr
 from components.auth import model
 from test_support import test_case
 
 
@@ skipping 927 matching lines @@
         'modified_by': model.Identity.from_bytes('user:a@example.com'),
         'modified_ts': datetime.datetime(2015, 1, 1, 1, 1),
       },
     }, self.grab_log(model.AuthIPWhitelistAssignments))
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   unittest.main()