fix for preventing OOM issues while importing large number of entries (DIRSERVER-2002)


git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1624283 13f79535-47bb-0310-9956-ffa450edef68
added a dedicated logger to log the time taken to perform a simple search


git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1624292 13f79535-47bb-0310-9956-ffa450edef68