Merge pull request #24433 from owncloud/user_psr4

apps/user_ldap/user_ldap.php

lib/base.php

lib/private/User/Backend.php

lib/private/User/Database.php

lib/private/User/LoginException.php

lib/private/User/Manager.php

lib/private/User/NoUserException.php

lib/private/User/Session.php

lib/private/User/User.php

lib/private/legacy/user.php

lib/private/legacy/user/backend.php

lib/private/legacy/user/interface.php

tests/lib/user.php

tests/lib/user/backend.php

tests/lib/user/database.php

tests/lib/user/manager.php

tests/lib/user/user.php

tests/lib/util/user/dummy.php

tests/settings/controller/userscontrollertest.php