Update comments. No JNDI permission is granted now JNDI is not used to access files.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1542952 13f79535-47bb-0310-9956-ffa450edef68
Remove unused code

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1542957 13f79535-47bb-0310-9956-ffa450edef68