List security groups

def secgroup_list(self):
        '''
        List security groups
        '''
        nt_ks = self.compute_conn
        ret = {}
        for item in nt_ks.security_groups.list():
            ret[item.name] = {
                'name': item.name,
                'description': item.description,
                'id': item.id,
                'tenant_id': item.tenant_id,
                'rules': item.rules,
            }
        return ret