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

masters/master.chromium.fyi/master.cfg

 # vim: ft=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.changes.filter import ChangeFilter
 from buildbot.scheduler import Dependent
 from buildbot.scheduler import Nightly
 from buildbot.scheduler import Periodic
 from buildbot.scheduler import Scheduler
@@ skipping 24 matching lines @@
 
 DRMEMORY_NOTIFIER = True
 
 STATUS_PUSH = False
 
 # This is the dictionary that the buildmaster pays attention to. We also use
 # a shorter alias to save typing.
 c = BuildmasterConfig = {}
 c['status'] = []
 
-config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
+config.DatabaseSetup(c)
 
 ####### CHANGESOURCES
 
 # Polls config.Master.trunk_url for changes
 chromium_repo_url = config.Master.git_server_url + '/chromium/src'
 trunk_poller = gitiles_poller.GitilesPoller(chromium_repo_url,
                                             project='chromium')
 
 c['change_source'] = [trunk_poller]
 
@@ skipping 1355 matching lines @@
       ]))
 
 c['status'].append(MailNotifier(
       fromaddr=ActiveMaster.from_address,  # Reply-To address
       mode='failing',
       relayhost=config.Master.smtp,
       subject='Build failure on %(builder)s',
       extraRecipients=['sbc@chromium.org'],
       sendToInterestedUsers=False,
       builders=['Linux ARM']))