Polling interval decay

[Gabriel Hurley]

To reduce server load when an instance is in a stuck state or taking a long time to complete a task, we should implement an interval decay formula so that polling frequency decreases over time for unchanging responses.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/5120

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/5120
Committed: http://github.com/openstack/horizon/commit/dfe55c00b6738e8f3b9ea904ed3efbe3ab45a379
Submitter: Jenkins
Branch: master

commit dfe55c00b6738e8f3b9ea904ed3efbe3ab45a379
Author: Andy Chong <email address hidden>
Date: Fri Mar 9 12:24:57 2012 +0800

    add progressive interval delay, extra checks in ajax row update polling

     * fix bug 948429, increase interval multiplier if row no update
     * fix bug 948432, with following changes
       * update row with replace only if html differs (changes found)
       * do not trigger ajax request if row action is expanded
       * still trigger ajax request if row checkbox is checked
         and the checkbox is remained checked if row replaced
     * fix bug 953268, see last point above

    Change-Id: I487407289305694025a555f1dc96317d17416307