Added a alias cache to speed up searches

git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1547048 13f79535-47bb-0310-9956-ffa450edef68
Added a alias cache to speed up searches

git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1547049 13f79535-47bb-0310-9956-ffa450edef68