Return server's IP addresses

Example response

{
  "data": {
    "ip": [
      {
        "active": 1,
        "if": "eth0",
        "ip": "192.168.0.20",
        "netmask": "255.255.0.0",
        "network": "192.168.0.0",
        "public_ip": "10.1.32.177",
        "used": 1
      }
    ]
  },
  "metadata": {
    "command": "listips",
    "reason": "OK",
    "result": 1,
    "version": 1
  }
}