Don't require a .dbconfig file on any masters.

masters/master.chromiumos.tryserver/master.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # Copyright (c) 2012 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 os
 import random
 import shutil
@@ skipping 16 matching lines @@
 import chromiumos_tryserver_util
 import config
 import master_site_config
 
 ActiveMaster = master_site_config.ChromiumOSTryServer
 
 # This is the dictionary that the buildmaster pays attention to. We also use
 # a shorter alias to save typing.
 c = BuildmasterConfig = {}
 
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 # Load our Cbuildbot configs.
 cbuildbot_configs = CbuildbotConfigs(
     chromiumos_tryserver_util.configs,
     etc_builder='etc',
 )
 
 ####### BUILDBUCKET
 
 # Install BuildBucket hooks so we can add/enforce CrOS properties.
@@ skipping 165 matching lines @@
     get_info=_GetInfo,
     relayhost=smtp_host,
     lookup=master_utils.UsersAreEmails()))
 
 # Do it at the end to override values set by AutoSetupMaster, the default is
 # too low. Must keep at least a few days worth of builds.
 c['buildHorizon'] = 3000
 c['logHorizon'] = 3000
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 200