[Findit] Implement retry within swarming_util.py when making server calls

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
 
 import gae_ts_mon
 
@@ skipping 75 matching lines @@
     'server_host': 'chromium-swarm.appspot.com',
     'default_request_priority': 150,
     'request_expiration_hours': 20,
     'server_query_interval_seconds': 60,
     'task_timeout_hours': 23,
     'isolated_server': 'https://isolateserver.appspot.com',
     'isolated_storage_url': 'isolateserver.storage.googleapis.com',
     'iterations_to_rerun': 10,
     'get_swarming_task_id_timeout_seconds': 5 * 60,  # 5 minutes.
     'get_swarming_task_id_wait_seconds': 10,
+    'server_retry_timeout_hours': 2,
+    'maximum_server_contact_retry_interval_seconds': 5 * 60,  # 5 minutes.
+    'should_retry_server': False,  # No retry for unit testing.
 }
 
 
 _DEFAULT_DOWNLOAD_BUILD_DATA_SETTINGS = {
     'download_interval_seconds': 10,
     'memcache_master_download_expiration_seconds': 3600,
     'use_chrome_build_extract': True,
 }
 
 
@@ skipping 42 matching lines @@
       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()
     self.maxDiff = None
     gae_ts_mon.reset_for_unittest(disable=True)