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.
Implement an Authenticator which can fulfill a dns-01 challenge using the
Cloudflare API. Applicable only for domains using Cloudflare for DNS.
Testing Done:
* `tox -e py27`
* `tox -e lint`
* Manual testing:
* Used `certbot certonly --dns-cloudflare -d`, specifying a
credentials file as a command line argument. Verified that a
certificate was successfully obtained without user interaction.
* Used `certbot certonly --dns-cloudflare -d`, without specifying a
credentials file as a command line argument. Verified that the user
was prompted and that a certificate was successfully obtained.
* Used `certbot certonly -d`. Verified that the user was prompted for
a credentials file after selecting cloudflare interactively and
that a certificate was successfully obtained.
* Used `certbot renew --force-renewal`. Verified that certificates
were renewed without user interaction.
* Negative testing:
* Path to non-existent credentials file.
* Credentials file with unsafe permissions (644).
* Credentials file missing e-mail address.
* Credentials file with blank API key.
* Credentials file with incorrect e-mail address.
* Credentials file with malformed API key.
* Credentials file with invalid API key.
* Domain name not registered to Cloudflare account.
