#### SUMMARY
This feature would implement a UpdateUserName command for the Accounts category of redfish_command, to update user name. And also implement a UpdatePasswordPolicy command for the Accounts category of redfish_command to change password policy.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
redfish_command

##### ADDITIONAL INFORMATION
These 2 commands would help user to update user name or update password policy

if not uri:
            response = self._find_account_uri(username=user.get('account_username'),
                                              acct_id=user.get('account_id'))
            if not response['ret']:
                return response
            uri = response['uri']
            data = response['data']
        if data and data.get('UserName') == '' and not data.get('Enabled', False):
            
            return {'ret': True, 'changed': False}
        payload = {'UserName': ''}
        if 'Enabled' in data:
            payload['Enabled'] = False
        response = self.patch_request(self.root_uri + uri, payload)
        if response['ret'] is False:
            return response
        return {'ret': True}
    def delete_user(self, user):