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Add AAAA records for autodiscover & autoconfig #1606
In researching autodiscover for Exchange and autoconfig for Thunderbird. There were only ever references to A record lookups in the specs. I found this post in the forums that referenced issues getting ssl certs because the AAAA records were missing for autodiscover.* and autoconfig.*.
It appears that certbot may have issues with not having both ipv6 & ipv4 addresses for a domain. (perhaps it globs all of the dns records for domains it intends to get on the same cert?). PR adds AAAA records if host has an IPV6 address.
I was not using ipv6 until today. I tested the PR, it adds the AAAA dns entries. I deleted my autoconfig certs and was able to re-issue certs for them.