Merge pull request #13829 from owncloud/appmanager-list

apps/files_sharing/tests/testcase.php

lib/private/app.php

lib/private/app/appmanager.php

lib/private/group/manager.php

lib/private/user.php

lib/private/util.php

lib/public/app/iappmanager.php

tests/lib/app.php

tests/lib/app/manager.php

tests/lib/appconfig.php

tests/lib/util.php