DERBY-590: Hide doPrivileged() blocks inside private methods, seal derbyoptionaltools.jar, and create more relevant SQLExceptions; commit derby-590-22-aa-cleanupPrivacy.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1586114 13f79535-47bb-0310-9956-ffa450edef68