#### 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 user.get('account_username'):
            return {'ret': False, 'msg':
                    'Must provide account_username for AddUser command'}
        response = self._find_account_uri(username=user.get('account_username'))
        if response['ret']:
            
            return {'ret': True, 'changed': False}
        response = self.get_request(self.root_uri + self.accounts_uri)
        if not response['ret']:
            return response
        headers = response['headers']
        if 'allow' in headers:
            methods = [m.strip() for m in headers.get('allow').split(',')]
            if 'POST' not in methods:
                
                return self.add_user_via_patch(user)
        payload = {}