Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/17076

Log:
commit 27868ddf260286d86c8e048934ffc7573d729702
Author: Davanum Srinivas <dims at linux.vnet.ibm.com>
Date:   Wed Nov 28 15:35:30 2012 -0500

    Don't run the periodic task if ticks_between_runs is below zero
    
    if the user sets say image_cache_manager_interval=-1, then
    don't add the task to the list of periodic tasks
    
    remove extra braces that i had added
    
    DocImpact
    
    Fixes LP #1084232
    
    Change-Id: Ieecd67ddbc70b815a88f40e72ca2899787d75988