Remove requirement for default settings in schema

[jimlambie]

Expected behavior

When POSTing to a config endpoint with a schema, the settings block should not be validated.

Actual behavior

The schema is validated to ensure settings exist for 'cache', 'authenticate', 'callback', 'defaultFilters', 'fieldLimiters', 'count'. Each of these can be set to a default in the model instead.

https://github.com/dadi/api/blob/master/dadi/lib/help.js#L249

Package details

API all versions