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

masters/master.tryserver.nacl/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.
 
 # READ THIS:
 # See http://dev.chromium.org/developers/testing/chromium-build-infrastructure
 
@@ skipping 17 matching lines @@
 
 nacl_source_url = (
     'https://chromium.googlesource.com/native_client/src/native_client')
 
 MAIL_NOTIFIER = True
 
 # 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)
 
 ####### CHANGESOURCES
 
 c['change_source'] = [ ]
 
 # Avoid merging requests.
 c['mergeRequests'] = lambda *_: False
 
 
 ####### BUILDERS
@@ skipping 211 matching lines @@
 c['eventHorizon'] = 100
 # Must be at least 2x the number of on-going builds.
 c['buildCacheSize'] = 100
 
 
 ####### PROJECT IDENTITY
 
 # The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 c['projectURL'] = 'http://go/ChromeTryServer'