Add script to update license's end year (#95)

* Add license renew tool scripts/renew_license.py. It could be used to update any mismatched year to current year

Author: singku

scripts/renew_license.py

@@ -0,0 +1,47 @@
+#
+# Copyright 2010-2017 Amazon.com, Inc. or its affiliates. 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.
+# A copy of the License is located at
+#
+#  http://aws.amazon.com/apache2.0
+#
+# or in the "license" file accompanying this file. This file 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.
+#
+
+# This script is used to update License end year for those hand crafted files
+# Auto-generated files will be automatically updated by code-generator when published to release candidate in our code pipeline
+# Simply modify OldLicense and NewLicense before running this script
+
+import fnmatch
+import filecmp
+import os
+import sys
+import datetime
+import re
+
+Now = datetime.datetime.now()
+
+NewLicense = "Copyright 2010-" + str(Now.year) + " Amazon.com"
+
+def updateLicense(inputFile):
+    with open(inputFile) as ftarget:
+        content = ftarget.read()
+
+    newContent = re.sub(r"Copyright 2010-201[\d] Amazon.com", NewLicense, content); 
+    if (content == newContent):
+        return False;
+
+    with open(inputFile, "w") as fdest:
+        fdest.write(newContent)
+    return True;
+
+RootDir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)));
+for root, dirnames, filenames in os.walk(RootDir):
+    for filename in fnmatch.filter(filenames, '*'):
+        targetFile = os.path.join(root, filename);
+        ret = updateLicense(targetFile)