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

masters/master.client.drmemory/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.
 
 # It has one job: define a dictionary named BuildmasterConfig. This
 # dictionary has a variety of keys to control different aspects of the
 # buildmaster. They are documented in docs/config.xhtml .
@@ skipping 17 matching lines @@
 ActiveMaster = master_site_config.DrMemory
 
 MASTER_HOST = ActiveMaster.master_host
 MAIL_NOTIFIER = ActiveMaster.is_production_host
 MASTER_PORT = ActiveMaster.master_port
 
 # 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)
 
 # 'slavePortnum' defines the TCP port to listen on. This must match the value
 # configured into the buildslaves (with their --master option)
 c['slavePortnum'] = ActiveMaster.slave_port
 
 slaves = slaves_list.SlavesList('slaves.cfg', 'DrMemory')
 
 
 ####### CHANGESOURCES
 
@@ skipping 200 matching lines @@
 
 ####### PROJECT IDENTITY
 
 # the 'projectName' string will be used to describe the project that this
 # buildbot is working on. For example, it is used as the title of the
 # waterfall HTML page. The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url