Break config_default into master_site_configs.

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 import svnpoller
 from buildbot.scheduler import Dependent
 from buildbot.scheduler import Nightly
 from buildbot.scheduler import Periodic
 from buildbot.scheduler import Scheduler
 from buildbot.scheduler import Triggerable
 from buildbot.status.mail import MailNotifier
 
 # These modules come from scripts/master, which must be in the PYTHONPATH.
 from master import build_utils
 from master import chromium_notifier
 from master import failures_notifier
 from master import master_config
 from master import master_utils
 from master import slaves_list
 
 from master.factory import chromeos_factory
 from master.factory import chromium_factory
 
 # These modules come from scripts/common, which must be in the PYTHONPATH.
 import config
+import master_site_config
 
 import master_gitzip_cfg
 import master_win_asan_cfg
 
-ActiveMaster = config.Master.ChromiumFYI
+ActiveMaster = master_site_config.ChromiumFYI
 
 CODESEARCH_NOTIFIER = True
 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 = {}
 
 config.DatabaseSetup(c, require_dbconfig=ActiveMaster.is_production_host)
@@ skipping 2261 matching lines @@
       subject='goma canary buildbot %(result)s in %(projectName)s '
               'on %(builder)s',
       extraRecipients=['goma+alert@google.com'],
       sendToInterestedUsers=False))
 
 
 ####### PROJECT IDENTITY
 
 # Buildbot master url:
 c['buildbotURL'] = 'http://build.chromium.org/p/chromium.fyi/'