[data processing] Add start/end times for job execution

[Chad Roberts]

This is a bug that needs to be ported from the sahara-dashboard repo to the merged horizon [+ data processing] codebase. Priority *wishlist*

On the data processing page for job execution details, start/end time is not shown for each job execution.
Given that start and end time are important details of a job execution. It should be shown on the page.

See also: https://review.openstack.org/#/c/99804/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/103653

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/103653
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=963f89ecb29e89c318fec39ded5417cb876798f3
Submitter: Jenkins
Branch: master

commit 963f89ecb29e89c318fec39ded5417cb876798f3
Author: Chad Roberts <email address hidden>
Date: Mon Jun 30 16:27:29 2014 -0400

    Adding start/end time to data processing-job execution details

    For the data processing -> job execution -> details page, we
    are adding start/end time for the job execution as details
    for the job execution being viewed.

    Change-Id: I931c836630f4a7a58f7c0b60161cfca6bbba9ee1
    Closes-Bug: bug #1336028
    Co-Authored-By: Andrew Lazarev <email address hidden>