Fixed validation of server's Joi options

[jgburet]

I encountered an error when trying to pass this to my server:

// ...
{
  modify: true,
  options: {
    stripUnknown: {
      objects: true,
      arrays: false
    }
  }
}

...telling me stripUnknown didn't meet requirement of having peer modify set to true.

It happened the validation made in Hapi was asserting stripUnknown was matching the validation of modify: a boolean. However, the documentation specifies stripUnknwon can also take an object.

Just to make a remark about my commit; I'm kind of disappointed to provide the validations for the inner values of the object here because I feel like this is not the job it is intended to. Especially since I'm not doing it there as it is resolved later by Joi itself.
I would prefer to stick with a simple:

// ...
otherwise: Joi.boolean().only(false)

Any preference?

[hueniverse]

This was too complicated. I kept it simple.

[lock]

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