Dates should be served in a correct UTC format

[Nikita Konovalov]

The dates returned in created_at and updated_at fields should be presented in valid UTC format. The only consumer of those fields is the event log tab in the cluster UI.

The correct date example looks like this: 2015-04-13T09:52:15.054383
However the milliseconds part may sometimes be skipped depending on SQL engine and SQLAlchemy circumstances, so to keep things consistent it's better to remove the milliseconds suffix from all dates.

The final date should look like this: 2015-04-13T09:52:15

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/170446
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=3b4f17bc18c34ae4c7ec37e9d4dff41a32abdc28
Submitter: Jenkins
Branch: master

commit 3b4f17bc18c34ae4c7ec37e9d4dff41a32abdc28
Author: Nikita Konovalov <email address hidden>
Date: Fri Apr 3 14:53:35 2015 +0300

    Date format set to be correct utc date

    As it turned out the format of the date used in Sahara may not be
    understood by som JavaScript engines which prevents the dates to be
    displayed correctly in UI. The milliseconds part of the time is also
    removed as it has never been necessary to access the dates with that
    accuracy. However the presence or sometime absence of the .ms suffix
    makes it harder to handle dates.

    Closes-Bug: #1443343
    Change-Id: I1f4cc6dc443605ba632c1458bba8bd47a0e1a01f

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/kilo
Review: https://review.openstack.org/196026

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/196026
Committed: https://git.openstack.org/cgit/openstack/sahara/commit/?id=1f2a06de196c9e17e4bfd45733617ff407d8f1f2
Submitter: Jenkins
Branch: stable/kilo

commit 1f2a06de196c9e17e4bfd45733617ff407d8f1f2
Author: Nikita Konovalov <email address hidden>
Date: Fri Apr 3 14:53:35 2015 +0300

    Date format set to be correct utc date

    As it turned out the format of the date used in Sahara may not be
    understood by som JavaScript engines which prevents the dates to be
    displayed correctly in UI. The milliseconds part of the time is also
    removed as it has never been necessary to access the dates with that
    accuracy. However the presence or sometime absence of the .ms suffix
    makes it harder to handle dates.

    Closes-Bug: #1443343
    Change-Id: I1f4cc6dc443605ba632c1458bba8bd47a0e1a01f
    (cherry picked from commit 3b4f17bc18c34ae4c7ec37e9d4dff41a32abdc28)