#### 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

try:
            resp = open_url(uri, data=json.dumps(pyld),
                            headers=POST_HEADERS, method="POST",
                            url_username=self.creds['user'],
                            url_password=self.creds['pswd'],
                            force_basic_auth=True, validate_certs=False,
                            follow_redirects='all',
                            use_proxy=False, timeout=self.timeout)
        except HTTPError as e:
            msg = self._get_extended_message(e)
            return {'ret': False,
                    'msg': "HTTP Error %s on POST request to '%s', extended message: '%s'"
                           % (e.code, uri, msg),
                    'status': e.code}
        except URLError as e:
            return {'ret': False, 'msg': "URL Error on POST request to '%s': '%s'"
                                         % (uri, e.reason)}
        
        except Exception as e:
            return {'ret': False,
                    'msg': "Failed POST request to '%s': '%s'" % (uri, to_text(e))}
        return {'ret': True, 'resp': resp}
    def patch_request(self, uri, pyld):