It looks like we're currently documenting functions that are marked private (prefixed with an underscore) such as https://certbot.eff.org/docs/api/certbot.crypto_util.html#certbot.crypto_util._load_cert_or_req. I do not think we should do this because the functionality is private, should not be used, and including it in our docs just adds visual noise.
This PR stops us from documenting private code and fixes up `tools/sphinx-quickstart.sh` so we don't document it in future modules.
* Do not document private code.
* Don't document private members in the future.
Introduce a plugin that automates the process of completing a dns-01 challenge by creating, and subsequently removing, TXT records using RFC 2136 Dynamic Updates (a.k.a. nsupdate).
This plugin has been tested with BIND, but may work with other RFC 2136-compatible DNS servers, such as PowerDNS.
