Python high-level tests for zone-sync feature - no TLS

[jjngx]

Add Python tests to cover the following scenarios:

• start NIC with the zone-sync configured in the nginx-ingress config map -> verify headless service created

• start NIC with the zone-sync NOT configured in the nginx-ingress config map -> verify no headless-svc present

• add zone-sync config params to the nginx-ingress config map -> verify the headless svc is configured automatically

• reconfigure port in zone-sync -> verify desired state (add more info)

• disable zone-sync in the nginx-ingress config map -> verify headless svc is removed from K8s

[github-actions]

Hi @jjngx thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!