Polish the code of InsertResponseOutHeaderProcessor for camel-cxf wiki

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1452688 13f79535-47bb-0310-9956-ffa450edef68
CAMEL-6128 try to use the InputStream if the StaxStreamReader is not working

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1452689 13f79535-47bb-0310-9956-ffa450edef68