[Findit] Moving check flake max_builds_to_look_back to config

appengine/findit/waterfall/test/wf_testcase.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.
 
 from google.appengine.api import users
 
 import copy
 
 from common.findit_testcase import FinditTestCase
 from model.wf_config import FinditConfig
@@ skipping 94 matching lines @@
     'cr_notification_build_threshold': 2,
     'cr_notification_latency_limit_minutes': 30,
 }
 
 
 _DEFAULT_CHECK_FLAKE_SETTINGS = {
     'lower_flake_threshold': 0.02,
     'upper_flake_threshold': 0.98,
     'max_flake_in_a_row': 4,
     'max_stable_in_a_row': 4,
-    'iterations_to_rerun': 100
+    'iterations_to_rerun': 100,
+    'max_build_numbers_to_look_back': 1000
 }
 
 
 DEFAULT_CONFIG_DATA = {
     'steps_for_masters_rules': _DEFAULT_STEPS_FOR_MASTERS_RULES,
     'builders_to_trybots': _DEFAULT_TRY_BOT_MAPPING,
     'try_job_settings': _DEFAULT_TRY_JOB_SETTINGS,
     'swarming_settings': _DEFAULT_SWARMING_SETTINGS,
     'download_build_data_settings': _DEFAULT_DOWNLOAD_BUILD_DATA_SETTINGS,
     'action_settings': _DEFAULT_ACTION_SETTINGS,
@@ skipping 16 matching lines @@
     if config_property and override_data:
       config_data = copy.deepcopy(DEFAULT_CONFIG_DATA)
       config_data[config_property].update(override_data)
 
     FinditConfig.Get().Update(users.User(email='admin@chromium.org'), True,
                               **config_data)
 
   def setUp(self):
     super(WaterfallTestCase, self).setUp()
     self.UpdateUnitTestConfigSettings()