dhcp-to-dns: handle duplicate mac-address and host-name

* several leases for one mac address (changed client id, different net):
   -> take address from last lease
  Most likely this is the same devices which booted different OS or
  changed to different network.

* several leases for one host name:
   -> take address from first lease
  We see either different devices with same name or one device with
  several network interfaces. Keep the first name to mitigate stealing
  dns name.

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