SourceIPSelector: set defaultSource to null to throw NotFound-exception when none of the zones are matched

* Restore nullable assocId for SLO

* Fix namespace

* Add changelog note

* Fix changelog

* Fix logout completion for SP

Reference parameters need to be explicitely marked as such in the arguments
array when using call_user_func_array().

Fixes the following exception:

SimpleSAML\Error\Exception: Warning - Parameter 1 to SimpleSAML\Auth\Source::completeLogout() expected to be a reference, value given at .../vendor/simplesamlphp/simplesamlphp/src/SimpleSAML/HTTP/RunnableResponse.php:72
Backtrace:
4 .../vendor/simplesamlphp/simplesamlphp/public/_include.php:86 (SimpleSAML_error_handler)
3 [builtin] (call_user_func_array)
2 .../vendor/simplesamlphp/simplesamlphp/src/SimpleSAML/HTTP/RunnableResponse.php:72 (SimpleSAML\HTTP\RunnableResponse::sendContent)
1 .../vendor/symfony/http-foundation/Response.php:394 (Symfony\Component\HttpFoundation\Response::send)
0 .../vendor/simplesamlphp/simplesamlphp/public/module.php:14 (N/A)

* Add note in changelog

---------

Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

* Reset submit-button on back-button

* Fix back-button for test-authsource page for non SP-sources

* Update changelog

* Add support for Redis-Sentinel.

* Add tests for redis sentinel store.

* Documentation about Redis-Sentinel and password protection.

* Fix markdown syntax brought up by github actions.

* Add missing config parameter to unit tests.

* Add missing return-type

* Fix indentation

* Fix incorrect configuration-methods

Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

Co-authored-by: Thijs Kinkhorst <thijs@kinkhorst.com>