Add Apache License content in conf.py file

Change-Id: I84478f02bc7f04ef57334a738fa0b1f3ca0cac45

releasenotes/source/conf.py

@@ -1,3 +1,16 @@
+# 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.
+
 # watcher documentation build configuration file, created by
 # sphinx-quickstart on Fri Jun  3 11:37:52 2016.
 #