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

appengine/components/tool_support/gae_sdk_utils.py

 # Copyright 2013 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.
 
 """Set of functions to work with GAE SDK tools."""
 
 import collections
 import getpass
 import glob
 import hashlib
@@ skipping 138 matching lines @@
     raise ValueError('setup_gae_sdk was already called.')
   _GAE_SDK_PATH = sdk_path
 
   sys.path.insert(0, sdk_path)
   # Sadly, coverage may inject google.protobuf in the path. Forcibly expulse it.
   if 'google' in sys.modules:
     del sys.modules['google']
 
   import dev_appserver
   dev_appserver.fix_sys_path()
+  for i in sys.path[:]:
+    if 'jinja2-2.6' in i:
+      sys.path.remove(i)
 
   # Make 'yaml' variable (defined on top of this module) point to loaded module.
   global yaml
   import yaml as yaml_module
   yaml = yaml_module
 
 
 def gae_sdk_path():
   """Checks that 'setup_gae_sdk' was called and returns a path to GAE SDK."""
   if not _GAE_SDK_PATH:
@@ skipping 446 matching lines @@
       print >> sys.stderr, 'Failed to unlock keyring: %s' % e
       return False
 
 
 def setup_gae_env():
   """Sets up App Engine Python test environment."""
   sdk_path = find_gae_sdk(PYTHON_GAE_SDK)
   if not sdk_path:
     raise RuntimeError('Couldn\'t find GAE SDK.')
   setup_gae_sdk(sdk_path)