Next datatables update can occur before previous AJAX request completes

[Janet Yu]

In horizon.tables.js, datatables is updated every next_poll milliseconds. If the AJAX request made in the previous call takes longer than next_poll milliseconds to complete, the two requests could return out of order. Also, there could be unexpected results if the first request modifies data after the second request has been made and now the second request has stale data.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/49645

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/49645
Committed: http://github.com/openstack/horizon/commit/999729f17f2f622469fab34c0dd2311f04feb704
Submitter: Jenkins
Branch: master

commit 999729f17f2f622469fab34c0dd2311f04feb704
Author: Janet Yu <email address hidden>
Date: Thu Oct 3 14:21:26 2013 -0700

    Update DataTables only after previous call is done

    When the update is always made at a set interval, the next update could
    be called before the previous one has completed. Data inconsistencies
    could arise from changes being made out of order in the updates. Move
    the code to call the next update to the "complete" function to make sure
    the previous call has finished before starting the next one.

    Change-Id: I946912a30934e8d25f83fadaef7c2b8b6db269b2
    Closes-Bug: #1231751