Change gae to apache 2 license.

service/module/interface.go

-// Copyright 2016 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.
+// 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 module
 
 // Interface is the interface for all of the package methods which normally
 // would be in the 'module' package.
 type Interface interface {
         List() ([]string, error)
         NumInstances(module, version string) (int, error)
         SetNumInstances(module, version string, instances int) error
         Versions(module string) ([]string, error)
         DefaultVersion(module string) (string, error)
         Start(module, version string) error
         Stop(module, version string) error
 }