Expose subadmin to OCP

apps/dav/tests/unit/CalDAV/Activity/Filter/GenericTest.php

apps/provisioning_api/lib/Controller/UsersController.php

...provisioning_api/tests/Controller/UsersControllerTest.php

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/Server.php

lib/private/SubAdmin.php

lib/public/Group/ISubAdmin.php

tests/Settings/Controller/AppSettingsControllerTest.php

tests/lib/SubAdminTest.php