Moved the control tests into a dedicated package

git-svn-id: https://svn.apache.org/repos/asf/directory/shared/trunk@1646595 13f79535-47bb-0310-9956-ffa450edef68
Added the ProxiedAuthz control, and its tests

git-svn-id: https://svn.apache.org/repos/asf/directory/shared/trunk@1646604 13f79535-47bb-0310-9956-ffa450edef68
Added the ProxiedAuthz control declaration and usage

git-svn-id: https://svn.apache.org/repos/asf/directory/shared/trunk@1646605 13f79535-47bb-0310-9956-ffa450edef68