autotest: fix DBusCalls flakiness

client/site_tests/login_DBusCalls/login_DBusCalls.py

 # Copyright (c) 2010 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
 from autotest_lib.client.bin import utils
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.cros import constants as chromeos_constants
 from autotest_lib.client.cros import cros_logging, cros_ui_test
+from autotest_lib.client.cros import login
 
 _SESSION_MANAGER_DEST='org.chromium.SessionManager'
 _SESSION_MANAGER_OBJECT='org.chromium.SessionManagerInterface'
 _SESSION_MANAGER_PATH='/org/chromium/SessionManager'
 
 class login_DBusCalls(cros_ui_test.UITest):
     version = 1
 
 
     def initialize(self, creds = '$default'):
@@ skipping 41 matching lines @@
                 lambda: message_log.can_find(grep_bait),
                 timeout=30,
                 exception=error.TestFail('Did not find %s in message log' %
                                          grep_bait))
         finally:
             logging.debug('Message log from RestartEntd: ' +
                           message_log.get_logs())
 
 
     def run_once(self):
-        self.login()
+        login.wait_for_cryptohome()
         self._test_restart_entd()