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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _sanatize_network_params(self, kwargs):
        '''
        Sanatize novaclient network parameters
        '''
        params = [
            'label', 'bridge', 'bridge_interface', 'cidr', 'cidr_v6', 'dns1',
            'dns2', 'fixed_cidr', 'gateway', 'gateway_v6', 'multi_host',
            'priority', 'project_id', 'vlan_start', 'vpn_start'
        ]

        for variable in six.iterkeys(kwargs):  # iterate over a copy, we might delete some
            if variable not in params:
                del kwargs[variable]
        return kwargs