[lib][schema] Make kavlan hashes optional
This allows the schema to validate even when kavlan is set to false for a cluster (such as when initially installing a cluster).
[En cours] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=146834656
[In progress] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=146834656
Mise à jour de sécurité programmée lundi 16/09/2024 à 9h. Interruption de service possible jusqu'à midi.
This allows the schema to validate even when kavlan is set to false for a cluster (such as when initially installing a cluster).