WiFi load testing has connection flakiness. Increase retries to 3.

client/site_tests/power_LoadTest/power_LoadTest.py

 # Copyright (c) 2011 The Chromium OS 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 logging, os, shutil, time
 from autotest_lib.client.bin import utils
 from autotest_lib.client.common_lib import error, site_power_status
 from autotest_lib.client.cros import backchannel, cros_ui, cros_ui_test
 from autotest_lib.client.cros import httpd, login
 
@@ skipping 72 matching lines @@
         # specified WiFi AP.
         if self._force_wifi:
             # If backchannel is already running, don't run it again.
             if not backchannel.setup():
                 raise error.TestError('Could not setup Backchannel network.')
 
             # Note: FlimFlam is flaky after Backchannel setup sometimes. It may
             # take several tries for WiFi to connect. More experimentation with
             # the retry settings here may be necessary if this becomes a source
             # of test flakiness in the future.
-            if not flimflam.FlimFlam().ConnectService(retry=True,
+            if not flimflam.FlimFlam().ConnectService(retries=3,
+                                                      retry=True,
                                                       service_type='wifi',
                                                       ssid=wifi_ap,
                                                       security=wifi_sec,
                                                       passphrase=wifi_pw,
                                                       mode='managed')[0]:
                 raise error.TestError('Could not connect to WiFi network.')
 
         if check_network and backchannel.is_network_iface_running('eth0'):
             raise error.TestError(
                 'Ethernet interface is active. Please remove Ethernet cable')
@@ skipping 212 matching lines @@
         # set backlight level to 40% of max
         cmd = 'backlight-tool --set_brightness %d ' % (
               int(self._max_backlight * 0.4))
         os.system(cmd)
 
         # record brightness level
         cmd = 'backlight-tool --get_brightness'
         level = int(utils.system_output(cmd).rstrip())
         logging.info('backlight level is %d' % level)
         self._tmp_keyvals['level_backlight_current'] = level