Fix zone lookup and handle "An identical record already exists" error

[yzqzss]

No description provided.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[yzqzss]

I also wrote an acme.sh DNS API client for dns01cf:

https://github.com/yzqzss/acme.sh_dns01cf