List all network
        List all of netowrks on some special cloud
        with:
        :Param  req
        :Type   object Request

def index(self, req, drivers):
        """List all network
        List all of netowrks on some special cloud
        with:
        :Param  req
        :Type   object Request
        """
        result = []
        for driver in drivers:
            result.append(driver.list_network(req.params))
        data = {
                'action': "index",
                'controller': "network",
                'cloud': req.environ['calplus.cloud'],
                'result': result
        }
        return data