Updated svn:externals to point to xdbm-refactoring branches. Only links to apacheds and shared were changed as no changes are expected in the other projects

git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/branches/xdbm-refactoring-with-dependencies@945840 13f79535-47bb-0310-9956-ffa450edef68