Certificate transparency data as baseline

[hellais]

ooniprobe currently doesn't fetch full cert chains, however if we were to start doing that a good baseline could be the data collected as part of certificate transparency.

This project includes some code to "polinate" CT auditors with domains we care about: https://github.com/SSLMate/ct-honeybee

[darkk]

Moreover, IIRC, it verifies certificates instead of just storing them. Content hidden behind bad certificates is especially interesting :)

[hellais]

cc @bassosimone this is relevant to the TLS certificate fetching work.