Milo: Fix naming of pubsub settings

milo/appengine/buildbot/build_test.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package buildbot
 
 import (
         "encoding/json"
         "flag"
         "fmt"
@@ skipping 83 matching lines @@
                         })
                         _, err := getBuild(c, "fake", "fake", 1)
                         So(err, ShouldResemble, errNotAuth)
                 })
         })
 }
 
 var internalConfig = `
 buildbot: {
         internal_reader: "googlers"
-        public_topic: "projects/luci-milo/subscriptions/buildbot-public"
-        internal_topic: "projects/luci-milo/subscriptions/buildbot-private"
+        public_subscription: "projects/luci-milo/subscriptions/buildbot-public"
+        internal_subscription: "projects/luci-milo/subscriptions/buildbot-private"
 }
 `
 
 var bbAclConfigs = map[string]memcfg.ConfigSet{
         "services/luci-milo": {
                 "settings.cfg": internalConfig,
         },
 }