DNSSEC support for PowerDNS
See #5161 (closed)
The changes in this PR enable the existing PowerDNS server plugin to arrange DNSSEC for the domain, when the checkbox for
dnssec_wanted is checked in the interface. It will also parse the KSK and DS records from the output afterwards, and expose them in the
dnssec_info textarea so the admin can set them at the registrar.