Do not poll /acme/issuer-cert when generating LetsEncrypt TLS certificates

From LetsEncrypt:

Hi,

As part of our due diligence prior to shutting down the ACME v2 API's /acme/issuer-cert endpoint, we detected that an ACME v2 client with useragent ansible-httpget and associated with contact address paddatrapper@debian.org appears to poll the endpoint in between issuances.

For example, we saw the client complete an issuance for jitsi-sandbox.video.fosdem.org on 2020-12-07 at 07:38 UTC, then poll the issuer-cert endpoint 13 times over the next ~36 hours, then begin another issuance for vogol-sandbox.video.fosdem.org on 2020-12-08 at 20:37 UTC.

Yours appears to be the only client exhibiting this behavior, so we assume you have something custom running. Please update your client to not query the /acme/issuer-cert endpoint before we remove it on Thursday, Jan 7, 2021.

More information can be found here: https://community.letsencrypt.org/t/acme-v2-removing-acme-issuer-cert-endpoint/140382

Thank you, Aaron, on behalf of Let's Encrypt

I am not sure if this was due to the network connectivity issues we were encountering or something with our LetsEncrypt role