Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/bot_update/test_api.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import hashlib
 import struct
 
-from slave import bot_update
-from slave import recipe_test_api
+from .resources import bot_update
+from recipe_engine import recipe_test_api
 
 
 class BotUpdateTestApi(recipe_test_api.RecipeTestApi):
   def output_json(self, master, builder, slave, root, first_sln,
                   revision_mapping, git_mode, force=False, fail_patch=False,
                   output_manifest=False):
     """Deterministically synthesize json.output test data for gclient's
     --output-json option.
     """
     active = bot_update.check_valid_host(master, builder, slave) or force
@@ skipping 47 matching lines @@
     return self.m.json.output(output)
 
   @staticmethod
   def gen_revision(project, GIT_MODE):
     """Hash project to bogus deterministic revision values."""
     h = hashlib.sha1(project)
     if GIT_MODE:
       return h.hexdigest()
     else:
       return struct.unpack('!I', h.digest()[:4])[0] % 300000