Add master. prefix to CQ config

syzygy/infra/config/cq.cfg

 # Copyright 2015 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 13 matching lines @@
   url: "https://codereview.chromium.org"
 }
 
 verifiers {
   reviewer_lgtm {
      committer_list: "project-syzygy-committers"
   }
 
   try_job {
     buckets {
-      name: "tryserver.client.syzygy"
+      name: "master.tryserver.client.syzygy"
       builders { name: "win_rel_try" }
       builders { name: "win_dbg_try" }
       builders { name: "win_x64_dbg_try" }
       builders { name: "win_x64_rel_try" }
     }
   }
 }