Open Stack

Hi, I'd like you to take a look at this patch for potential
DocImpact.
https://review.openstack.org/27160

Log:
commit 709e56ec8009092dfcbb3b75bd096b190d8eb8b3
Author: Alvaro Lopez Garcia <aloga at ifca.unican.es>
Date:   Thu Apr 18 17:28:27 2013 +0200

    Normalize the scheduler weights.
    
    The weighter was usint the raw values instead of normalizing them.
    If somebody wants to implement any weighter different than RAM we
    have to ensure that all weights are normalized before doing anything
    with them (that is, before applying the multiplier and before we sum
    the calculated weight to the object). In this change all the weights
    are normalized to 1, so that the final weight for a host will be:
    
        weight = w1_multiplier * norm_w1 + w2_multiplier * norm_w2 + ...
    
    The RAM weighter relied on setting the multiplier to -1 so as to make a
    reverse ordering and this is no longer true, therefore another option
    'ram_weight_inverse' has been added.
    
    DocImpact
    
    Change-Id: I81bf90898d3cb81541f4390596823cc00106eb20