#### 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

result = {}
        bios_attributes = {}
        key = "Bios"
        
        response = self.get_request(self.root_uri + systems_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']
        if key not in data:
            return {'ret': False, 'msg': "Key %s not found" % key}
        bios_uri = data[key]["@odata.id"]
        response = self.get_request(self.root_uri + bios_uri)
        if response['ret'] is False:
            return response
        result['ret'] = True
        data = response['data']
        for attribute in data[u'Attributes'].items():
            bios_attributes[attribute[0]] = attribute[1]
        result["entries"] = bios_attributes
        return result
    def get_multi_bios_attributes(self):