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    Convert the UpCloud network metadata description into
    Cloud-init's version 1 netconfig format.

    Example JSON:
    {
      "interfaces": [
        {
          "index": 1,
          "ip_addresses": [
            {
              "address": "94.237.105.53",
              "dhcp": true,
              "dns": [
                "94.237.127.9",
                "94.237.40.9"
              ],
              "family": "IPv4",
              "floating": false,
              "gateway": "94.237.104.1",
              "network": "94.237.104.0/22"
            },
            {
              "address": "94.237.105.50",
              "dhcp": false,
              "dns": [],
              "family": "IPv4",
              "floating": true,
              "gateway": "",
              "network": "94.237.105.50/32"
            }
          ],
          "mac": "32:d5:ba:4a:36:e7",
          "network_id": "031457f4-0f8c-483c-96f2-eccede02909c",
          "type": "public"
        },
        {
          "index": 2,
          "ip_addresses": [
            {
              "address": "10.6.3.27",
              "dhcp": true,
              "dns": [],
              "family": "IPv4",
              "floating": false,
              "gateway": "10.6.0.1",
              "network": "10.6.0.0/22"
            }
          ],
          "mac": "32:d5:ba:4a:84:cc",
          "network_id": "03d82553-5bea-4132-b29a-e1cf67ec2dd1",
          "type": "utility"
        },
        {
          "index": 3,
          "ip_addresses": [
            {
              "address": "2a04:3545:1000:720:38d6:baff:fe4a:63e7",
              "dhcp": true,
              "dns": [
                "2a04:3540:53::1",
                "2a04:3544:53::1"
              ],
              "family": "IPv6",
              "floating": false,
              "gateway": "2a04:3545:1000:720::1",
              "network": "2a04:3545:1000:720::/64"
            }
          ],
          "mac": "32:d5:ba:4a:63:e7",
          "network_id": "03000000-0000-4000-8046-000000000000",
          "type": "public"
        },
        {
          "index": 4,
          "ip_addresses": [
            {
              "address": "172.30.1.10",
              "dhcp": true,
              "dns": [],
              "family": "IPv4",
              "floating": false,
              "gateway": "172.30.1.1",
              "network": "172.30.1.0/24"
            }
          ],
          "mac": "32:d5:ba:4a:8a:e1",
          "network_id": "035a0a4a-77b4-4de5-820d-189fc8135714",
          "type": "private"
        }
      ],
      "dns": [
        "94.237.127.9",
        "94.237.40.9"
      ]
    }
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