DERBY-6589: Add the new Security Guide to the top level repackagedocs target used at release publication time; commit derby-6589-02-aa-repackagedocsTarget.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1598590 13f79535-47bb-0310-9956-ffa450edef68