Add Apache license header to suppressions.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@1439983 13f79535-47bb-0310-9956-ffa450edef68

Author: netomi

src/conf/checkstyle-suppressions.xml

@@ -1,5 +1,21 @@
 <?xml version="1.0"?>
 <!DOCTYPE suppressions PUBLIC "-//Puppy Crawl//DTD Suppressions 1.0//EN" "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
+<!--
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You 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.
+-->
 
 <suppressions>