##### SUMMARY
This feature would implement a SetManagerNic command for the Manager category of redfish_config, to update Manager NIC configuration. 

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
redfish_config

##### ADDITIONAL INFORMATION
This command would help user to configure their Manager NIC.
response = self.get_request(self.root_uri + self.accounts_uri)
        if response['ret'] is False:
            return response
        data = response['data']
        uris = [a.get('@odata.id') for a in data.get('Members', []) if
                a.get('@odata.id')]
        if uris:
            
            uris += [uris.pop(0)]
        for uri in uris:
            response = self.get_request(self.root_uri + uri)
            if response['ret'] is False:
                continue
            data = response['data']
            headers = response['headers']
            if data.get('UserName') == "" and not data.get('Enabled', True):
                return {'ret': True, 'data': data,
                        'headers': headers, 'uri': uri}
        return {'ret': False, 'no_match': True, 'msg':
                'No empty account slot found'}
    def list_users(self):