Added support for /servers/{server_id}/zones query parameter dnssec in PowerDns::listZones

[frankvanhest]

Performance improvement for PowerDns::listZones

Description

By adding support to include dnssec query parameter when calling /servers/{server_id}/zones you can set this to false to speed up the performance. With 12000 zones for example the time goes from ±8.8 seconds to ±0.9 seconds.

Motivation and context

See linked issue #60.

How has this been tested?

The unit test for listZones is changed to test the behaviour.
When comparing the results for dnssec query parameter set to true and false I couldn't see any difference with my local setup. My knowledge of PowerDNS is limited. So perhaps you can see a differents in the result from PowerDNS API.

Screenshots (if appropriate)

N/A

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• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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[trizz]

Looking nice! Thanks!

[styxit]

This has just been released in v3.1.0. Thank you.