Add a question about the opt-out mechanism

[fmarier]

I thought about adding a question to the request form because sometimes (e.g. the non-telemetry cases) the opt-out mechanism is not obvious.

But then I thought about it again and the opt out needs to be clearly spelled out in our documentation. If it's not obvious from the request, the documentation should get an r- and get fixed.

In fact, if it's not in the request form then the data steward will need to double-check that it's part of the public documentation before answering the question in the review form.

What do you think @rjweiss @liuche ?

[liuche]

It sounds reasonable to me to make it explicit, and doesn't make the questionnaire too long - and the writers of the probe should know how it's controlled, and for most part, this should be an easy question.

[rjweiss]

We will have to revisit this while we address issue #3, but I agree with the above.