Backport https://github.com/jclouds/jclouds/pull/472

resources/checkstyle.xml

@@ -54,6 +54,25 @@
           <property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, EQUAL, GE, GT, LAND, LE, LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, SL, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, TYPE_EXTENSION_AND" />
         </module>
     </module>
+    <module name="Header">
+        <property name="header" value="/*\n
+* Licensed to the Apache Software Foundation (ASF) under one or more\n
+* contributor license agreements.  See the NOTICE file distributed with\n
+* this work for additional information regarding copyright ownership.\n
+* The ASF licenses this file to You under the Apache License, Version 2.0\n
+* (the &quot;License&quot;); you may not use this file except in compliance with\n
+* the License.  You may obtain a copy of the License at\n
+*\n
+*     http://www.apache.org/licenses/LICENSE-2.0\n
+*\n
+* Unless required by applicable law or agreed to in writing, software\n
+* distributed under the License is distributed on an &quot;AS IS&quot; BASIS,\n
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n
+* See the License for the specific language governing permissions and\n
+* limitations under the License.\n
+*/\n"/>
+        <property name="fileExtensions" value="java"/>
+    </module>    
     <module name="RegexpMultiline">
         <property name="format" value="@author"/>
         <property name="message" value="Do not use Javadoc @author annotation"/>