This patch adds jsonschema validation for below quota classes API's
* PUT /v3/{admin_project_id}/os-quota-class-sets/{quota_class_name}
APIImpact : quota class update API will raise BadRequest(400) for
quota classes keys other than those accepted by quotas and
group_quotas resources.
Change-Id: Id7ac6ec88a4b0ea83131d929a9d607f2c4e3429b
Partial-Implements: bp json-schema-validation