make http response to AcraServer api to generate new zone and return tuple
    of zone id and public key

def get_zone():
    """make http response to AcraServer api to generate new zone and return tuple
    of zone id and public key
    """
    response = urlopen('{}/getNewZone'.format(ACRA_CONNECTOR_API_ADDRESS))
    json_data = response.read().decode('utf-8')
    zone_data = json.loads(json_data)
    return zone_data['id'], b64decode(zone_data['public_key'])