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

masters/master.client.v8/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.
 
 from buildbot.scheduler import Nightly
 from buildbot.scheduler import Scheduler
 
@@ skipping 13 matching lines @@
 MAIL_NOTIFIER = ActiveMaster.is_production_host
 
 # This is the dictionary that the buildmaster pays attention to. We also use
 # a shorter alias to save typing.
 c = BuildmasterConfig = {}
 c['status'] = []
 
 
 ####### DATABASE
 
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 ####### CHANGESOURCES
 
 comparator = gitiles_poller.GitilesRevisionComparator()
 c['change_source'] = [
   gitiles_poller.GitilesPoller(
     'https://chromium.googlesource.com/v8/v8',
     branches=['master'],
     pollInterval=10,
     comparator=comparator,
@@ skipping 646 matching lines @@
 # too low. Must keep at least a few days worth of builds.
 c['buildHorizon'] = 1000
 c['logHorizon'] = 500
 # Must be at least 2x the number of slaves.
 c['eventHorizon'] = 200
 
 ####### PROJECT IDENTITY
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url