Latest commit ce99f51 Dec 22, 2016 @saturday-shi saturday-shi committed with vanzin [SPARK-18537][WEB UI] Add a REST api to serve spark streaming informa…
…tion

## What changes were proposed in this pull request?

This PR is an inheritance from #16000, and is a completion of #15904.

**Description**

- Augment the `org.apache.spark.status.api.v1` package for serving streaming information.
- Retrieve the streaming information through StreamingJobProgressListener.

> this api should cover exceptly the same amount of information as you can get from the web interface
> the implementation is base on the current REST implementation of spark-core
> and will be available for running applications only
>
> https://issues.apache.org/jira/browse/SPARK-18537

## How was this patch tested?

Local test.

Author: saturday_s <[email protected]>
Author: Chan Chor Pang <[email protected]>
Author: peterCPChan <[email protected]>

Closes #16253 from saturday-shi/SPARK-18537.