Add missing license header to test file

All the other tests have license headers, so this one should too.

I picked 2013 for the copyright year because that's when "git log"
says it was first and last touched.

Change-Id: Idd41a179322a3383f6992e72d8ba3ecaabd05c47

test/unit/locale/test_locale.py

@@ -1,5 +1,19 @@
 #!/usr/bin/env python
 #-*- coding:utf-8 -*-
+# Copyright (c) 2013 OpenStack Foundation
+#
+# 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,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 import os
 import unittest