Removing expiry dates for TOFU

[Natalie Pendragon]

On Tue, Jul 07, 2020 at 11:30:20AM +0200, Solderpunk wrote:
> I'd love to have detail stats on the actual proportion of servers
> using self-signed vs CA-signd certs over time! There seems to be
> more enthusiasm behind TOFU at the moment than at other times in the
> relatively recent past.

I can gladly start tracking this with the next GUS crawl, but we're
getting beyond my expertise. I have a very lightly modified version
[0] of Jason McBrayer's gusmobile [1] (in Python) that I think has
been, thankfully, the sole arbiter of all things TLS for GUS. If
anyone is interested in altering that code, or helping me figure out
how to alter that code, to return info on self-signed vs CA-signed
distinctions, we could get statistics on this soon.

[0] https://git.sr.ht/~natpen/gusmobile
[1] https://git.carcosa.net/jmcbray/gusmobile/