License header, formatting.

Addresses:
#3951 (comment)
#3951 (comment).

Author: tseaver

spanner/tests/system/utils/scrub_instances.py

@@ -1,11 +1,24 @@
+# Copyright 2017 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,
+# 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.
+
 from google.cloud.spanner import Client
 from .streaming_utils import INSTANCE_NAME as STREAMING_INSTANCE
 
 STANDARD_INSTANCE = 'google-cloud-python-systest'
 
 
 def scrub_instances(client):
-
     for instance in client.list_instances():
         if instance.name == STREAMING_INSTANCE:
             print('Not deleting streaming instance: {}'.format(