Make all the rest of the recipes explicitly specify GIT_MODE

scripts/slave/recipe_modules/recipe_tryjob/api.py

 # Copyright 2016 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 collections
 import hashlib
 import json
 import re
 
 from recipe_engine import recipe_api
@@ skipping 249 matching lines @@
         '-u', script] + args, **kwargs)
 
   def run_tryjob(self, patches_raw, rietveld, issue, patchset, patch_project):
     patches = parse_patches(
         self.m.python.failing_step, patches_raw, rietveld, issue, patchset,
         patch_project)
 
     root_dir = self.m.path['slave_build']
 
     # Needed to set up the infra checkout, for _python
-    self.m.gclient.set_config('infra')
+    self.m.gclient.set_config('infra', GIT_MODE=True)
     self.m.gclient.c.solutions[0].revision = 'origin/master'
     self.m.gclient.checkout()
     self.m.gclient.runhooks()
 
     url_mapping = self.m.luci_config.get_projects()
 
     # TODO(martiniss): use luci-config smarter; get recipes.cfg directly, rather
     # than in two steps.
     # luci config project name to recipe config namedtuple
     recipe_configs = {}
@@ skipping 31 matching lines @@
               'no reference builder; file a bug to get one?'] = (
                   FILE_BUG_FOR_CONTINUOUS_LINK)
 
 
     if bad_projects:
       raise recipe_api.StepFailure(
           "One or more projects failed tests: %s" % (
               ','.join(bad_projects)))