#### 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

response = self.get_request(self.root_uri + self.service_root)
        if response['ret'] is False:
            return response
        data = response['data']
        if 'SessionService' not in data:
            return {'ret': False, 'msg': "SessionService resource not found"}
        else:
            session_service = data["SessionService"]["@odata.id"]
            response = self.get_request(self.root_uri + session_service)
            if response['ret'] is False:
                return response
            data = response['data']
            sessions = data['Sessions']['@odata.id']
            if sessions[-1:] == '/':
                sessions = sessions[:-1]
            self.sessions_uri = sessions
        return {'ret': True}
    def _find_systems_resource(self):