Updates a VPN service

def update_vpnservice(self, vpnservice, desc):
        '''
        Updates a VPN service
        '''
        vpnservice_id = self._find_vpnservice_id(vpnservice)
        body = {'description': desc}
        return self.network_conn.update_vpnservice(vpnservice_id,
                                                   body={'vpnservice': body})