Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/16626

Log:
commit c520d6bf1f6a242675708624acc44c0eae184dae
Author: Chris Behrens <cbehrens at codestud.com>
Date:   Wed Nov 21 09:39:04 2012 +0000

    Cells: Add periodic instance healing
    
    Adds a periodic task that'll sync instance information to API cells
    periodically.  Does a handful of instances per periodic task run based
    on config values.
    
    instance_update_interval      -- Number of seconds between syncing
    instance_updated_at_threshold -- Number of seconds after an instance was
                                     updated or deleted to continue to sync
                                     (Ie, don't sync instances updated more
                                     than 'x' seconds ago.)
    instance_update_num_instances -- Number of instances to update per periodic
                                     task run
    
    Implements blueprint nova-compute-cells
    
    DocImpact
    
    Change-Id: I3103c3a69ab9cf0ec3e399abe046ed0d216234ab