Tolerate pdns 3.x API deficiencies
Tolerate pdns 3.x API deficiencies

PowerDNS 3.x API does not support setting or getting account info.

This patch lets PowerDNS 3.x users use the rest of the interface without problems.
Account stuff still does not work.

A message is logged in debug mode, to help with troubleshooting on newer versions
of PowerDNS.

ngoduykhanh/PowerDNS-Admin,ngoduykhanh/PowerDNS-Admin,ngoduykhanh/PowerDNS-Admin,ngoduykhanh/PowerDNS-Admin