[SPARK-5231][WebUI] History Server shows wrong job submission time.

History Server doesn't show collect job submission time.
It's because `JobProgressListener` updates job submission time every time `onJobStart` method is invoked from `ReplayListenerBus`.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #4029 from sarutak/SPARK-5231 and squashes the following commits:

0af9e22 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5231
da8bd14 [Kousuke Saruta] Made submissionTime in SparkListenerJobStartas and completionTime in SparkListenerJobEnd as regular Long
0412a6a [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-5231
26b9b99 [Kousuke Saruta] Fixed the test cases
2d47bd3 [Kousuke Saruta] Fixed to record job submission time and completion time collectly