Re: [whatwg/fetch] Cache-mode and upstream Cache-Control (#722)

I created some tests for the current spec; it looks like Safari passes all, Chrome has one error (it sends `Cache-Control: no-cache` instead of `max-age=0` when the mode is `no-cache`) and Firefox has a number of errors.

I can get the results I need if the spec is followed (not changing `Cache-Control` when it's already set). I still think the right thing for Fetch to be doing is _not_ setting headers based upon what it thinks the developer wants.

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