Removing exchange-v2

[Augie Fackler]

Make it so IMO.

> On Dec 3, 2021, at 9:41 AM, Raphaël Gomès <raphael.gomes at octobus.net> wrote:
> 
> Hi all,
> 
> The exchange-v2 protocol has been untouched for years now, is incomplete and does not seem to have any chance at coming back to life. Its tests are unreliable enough to make the CI flaky, which can be quite annoying for the developers using it daily (though it's nothing compared to the Windows flakiness, but we're working on that).
> 
> I thought I'd send this email in case someone was preparing to get back on that horse soon, complete the implementation and fix those tests. If there are no takers by the end of the month (year!), I'll remove all of the code and the associated tests.
> 
> Thanks,
> Raphaël
> 
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