Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55119
Avoid CVE-2013-1571 when generating Javadoc
Back-port of http://svn.apache.org/r1495875

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1557724 13f79535-47bb-0310-9956-ffa450edef68
Propose an updated patch based on review comments

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1557727 13f79535-47bb-0310-9956-ffa450edef68
Proposal

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc6.0.x/trunk@1557728 13f79535-47bb-0310-9956-ffa450edef68