Remove LDAP BaseDirectoryService*

This task is to remove the LDAP BaseDirectoryService* classes in gateway-demo-ldap. Instead we can use DefaultDirectoryService from Apache Directory. BaseDirectoryService* was only created to provide a way to override showSecurityWarnings - but this method is protected in Apache Directory 2.0.0-M16 so there is no need for it any longer.

Also removed some commented out Apache Directory dependencies from the poms, and removed apacheds-core-integ from gateway-test-release, as it's not needed.