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

appengine/components/components/auth/ipaddr_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 sys
 import unittest
 
-from test_support import test_env
+import test_env
 test_env.setup_test_env()
 
 from components.auth import ipaddr
 from test_support import test_case
 
 
 class IpAddrTest(test_case.TestCase):
   def test_ip_from_string_v4_ok(self):
     self.assertEqual(
         ipaddr.IP(32, 0), ipaddr.ip_from_string('0.0.0.0'))
@@ skipping 179 matching lines @@
         'ffff:fffe:fffd:fffc:fffb:fffa:fff0:2',
         'ffff:fffe:fffd:fffc:fffb:fffa:fff0:0/127'))
 
     self.assertFalse(call('0:0:0:0:0:0:0:0', '0.0.0.0/32'))
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   unittest.main()