POST api/Order/CancelOrder
概述：携程告诉供应商取消的订单，供应商判断该订单是否能取消，如有违约金由供应商返回违约金额。
Response Information
Response body formats
application/json, text/json
Sample:
{}
application/xml, text/xml
Sample:
<z:anyType xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/" />