pdns: notify secondary servers after updates #1679
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This change addresses the PowerDNS DNS provider.
When using the API with a setup where there is not only the primary but also some secondary servers, the secondary servers were not sent a
NOTIFYand would not initiate an AXFR transfer.Thus, the challenge would not propagate to all DNS servers which would in return cause failed verifications.
This change uses the
/notifyendpoint of the PowerDNS API to notify the secondaries.