Bug#1031398: debian-installer-utils: fetch-url fails with https if system date is wrong

[Emanuele Rocca <ema@debian.org>]

Package: debian-installer-utils
Version: 1.144

Booting with preseed/url=https://example.org/preseed.cfg fails if the system's
clock is awfully wrong. I've got a system convinved that today is January 1st,
1970 and unsurprisingly the wget certificate check fails. Also unsurprisingly
adding debian-installer/allow_unauthenticated_ssl=true is a viable workaround.

Given that AFAIK d-i does support setting the date with ntp, it may possibly
make sense to do that before wgetting the preseed file?

Thanks,
  Emanuele