[SPARK-20464][SS] Add a job group and description for streaming queri…

…es and fix cancellation of running jobs using the job group

## What changes were proposed in this pull request?

Job group: adding a job group is required to properly cancel running jobs related to a query.
Description: the new description makes it easier to group the batches of a query by sorting by name in the Spark Jobs UI.

## How was this patch tested?

- Unit tests
- UI screenshot

  - Order by job id:
![screen shot 2017-04-27 at 5 10 09 pm](https://cloud.githubusercontent.com/assets/7865120/25509468/15452274-2b6e-11e7-87ba-d929816688cf.png)

  - Order by description:
![screen shot 2017-04-27 at 5 10 22 pm](https://cloud.githubusercontent.com/assets/7865120/25509474/1c298512-2b6e-11e7-99b8-fef1ef7665c1.png)

  - Order by job id (no query name):
![screen shot 2017-04-27 at 5 21 33 pm](https://cloud.githubusercontent.com/assets/7865120/25509482/28c96dc8-2b6e-11e7-8df0-9d3cdbb05e36.png)

  - Order by description (no query name):
![screen shot 2017-04-27 at 5 21 44 pm](https://cloud.githubusercontent.com/assets/7865120/25509489/37674742-2b6e-11e7-9357-b5c38ec16ac4.png)

Author: Kunal Khamar <kkhamar@outlook.com>

Closes apache#17765 from kunalkhamar/sc-6696.

(cherry picked from commit 6fc6cf8)

sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala

@@ -633,7 +633,7 @@ class StreamExecution(
           ct.dataType)
       case cd: CurrentDate =>
         CurrentBatchTimestamp(offsetSeqMetadata.batchTimestampMs,
-          cd.dataType, cd.timeZoneId)
+          cd.dataType)
     }
 
     reportTimeTaken("queryPlanning") {