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Metadata-generation tweaks.
It was reported to Open Formulieren that the generated (eHerkenning) metadata is not
according to spec. This has been resolved in this release. No runtime authentication
behaviour should be changed.
* Updated the XSD for service catalog to v1.24.
* Removed the default requested attributes from eHerkenning config model.
* eHerkenning metadata tests now perform SAML v2.0 XSD validation.
* Removed the forbidden NameIDFormat element from the eHerkenning metadata.
* If both eHerkenning and eIDAS assertion consumer services are included, the
eHerkenning service is marked as default.
* Removed the SHA1 signing/digest algorithms from the available options for eHerkenning.
* Removed the ``use`` attribute from the key descriptors in the eHerkenning metadata,
marking each key as used for both encryption and signing.