add license in ChangeMetastoreWriteDbMonitor

hivemetastore-change-monitor/ChangeMetastoreWriteDbMonitor.py

@@ -1,5 +1,18 @@
 # -*- coding: utf-8 -*-
 #!/usr/bin/env python
+#
+# 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. See accompanying LICENSE file.
+#
 
 import httplib, urllib, urllib2, logging, os, time, sys