Fix some options for PutPolicy

* Add options: "returnUrl" and "callbackBody"
* Remove unsupported (deleted?) options: "escape" and "persistentPipeline"

(according to [PutPolicy.java](https://github.com/qiniu/java-sdk/blob/v6.1.0/src/main/java/com/qiniu/api/rs/PutPolicy.java))