auth: support YAML as the configuration file format

[poupryc]

• Program: Authoritative
• Issue type: Feature request

Short description

Recursive has almost entirely switched to YAML format for its configuration, as this is now the recommended way to write them. See more at https://docs.powerdns.com/recursor/yamlsettings.html. I searched a bit on the github, there doesn't seem to be any mention of a potential change.

Should Authoritative follow suit?

Usecase

Have a pdns.yml file instead of the current pdns.conf (or better, a authoritative.yml or auth.yml to be consistent with Recursive).

[dsp0redy]

Does it mean to update pdns.conf to pdns.yml and going further every thing need to be in .yml right?

[poupryc]

Kinda @dsp0redy, but with a different structure as in pdns recursor.