Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54888
Support a csv list with the ForEach tag plugin
Based on a patch provided by Sheldon Shao

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1477051 13f79535-47bb-0310-9956-ffa450edef68