GitLab

use slapconfiguration.jsonschema to validate instance parameters and define defaults values from json schema.

so far it is only used to validate Instance parameters and not parameters from shared instances allocated on the instance node.

Plan

1. Validate this MR that only validate main instances parameters (root, frontend, kedifa)
2. Update production
3. Rebase !1975 on this and validate the MR with silent validation of hosted shared instance (it is not enforced).
4. Update Production: The goal is to audit the validation of hosted shared instance and check which isntances would need update (DNS Validation, bad parameters...)
5. Adjust instances parameters and CDN validation.