#### 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 = {}
        key = "Bios"
        
        response = self.get_request(self.root_uri + self.systems_uris[0])
        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']
        
        if attr['bios_attr_name'] not in data[u'Attributes']:
            return {'ret': False, 'msg': "BIOS attribute not found"}
        
        if data[u'Attributes'][attr['bios_attr_name']] == attr['bios_attr_value']:
            return {'ret': True, 'changed': False, 'msg': "BIOS attribute already set"}
        set_bios_attr_uri = data["@Redfish.Settings"]["SettingsObject"]["@odata.id"]
        
        bios_attr = "{\"" + attr['bios_attr_name'] + "\":\"" + attr['bios_attr_value'] + "\"}"
        payload = {"Attributes": json.loads(bios_attr)}
        response = self.patch_request(self.root_uri + set_bios_attr_uri, payload)
        if response['ret'] is False:
            return response