Ensure the packed version of protobuf is used on bot tests.

appengine/swarming/swarming_bot/test_env_bot.py

 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import os
 import sys
 
 
 # swarming_bot/
 BOT_DIR = os.path.dirname(os.path.realpath(os.path.abspath(__file__)))
@@ skipping 18 matching lines @@
       if '\n' in link:
         continue
       dest = os.path.normpath(os.path.join(root, link))
       # This is not exactly right but close enough.
       sys.path.insert(0, os.path.dirname(dest))
 
 
 def setup_test_env():
   """Sets up the environment for bot tests."""
   init_symlinks(BOT_DIR)
-  client_tests = os.path.normpath(
-      os.path.join(BOT_DIR, '..', '..', '..', 'client', 'tests'))
+  client = os.path.normpath(os.path.join(BOT_DIR, '..', '..', '..', 'client'))
+  client_tests = os.path.join(client, 'tests')
   sys.path.insert(0, client_tests)
 
   tp = os.path.join(BOT_DIR, 'third_party')
   if sys.platform == 'win32':
     # third_party is a symlink.
     with open(tp, 'rb') as f:
       tp = os.path.join(BOT_DIR, f.read())
   sys.path.insert(0, tp)
 
   # libusb1 expects to be directly in sys.path.
   sys.path.insert(0, os.path.join(BOT_DIR, 'python_libusb1'))
 
   # For python-rsa.
   sys.path.insert(0, os.path.join(tp, 'rsa'))
   sys.path.insert(0, os.path.join(tp, 'pyasn1'))
+
+  # Protobuf is now used in the bot itself.
+  # See fix_protobuf_package() in appengine/components/components/utils.py
+  # but until this code, the version under client is used.
+  if 'google' in sys.modules:
+    # It may be in lib/python2.7/site-packages/google, take not chance and flush
+    # it out.
+    del sys.modules['google']
+  # This should import client/third_party/google
+  import google
+  google_pkg = os.path.join(client, 'third_party', 'google')
+  if google_pkg not in google.__path__:
+    google.__path__.insert(0, google_pkg)
+  six_path = os.path.join(client, 'third_party', 'six')
+  if six_path not in sys.path:
+    sys.path.insert(0, six_path)