Open Stack

Hi, I'd like you to take a look at this patch for potential
SecurityImpact.
https://review.openstack.org/275735

Log:
commit 1fd4e04e180eb63a9513db733967234183a6c5a3
Author: Erno Kuvaja <jokke at usr.fi>
Date:   Tue Jan 19 13:37:05 2016 +0000

    Prevent user to remove last location of the image
    
    If the last location of the image is removed, image transitions back to queued.
    This allows user to upload new data into the existing image record. By
    preventing removal of the last location we prevent the image transition back to
    queued.
    
    This change also prevents doing the same operation via replacing the locations
    with empty list.
    
    SecurityImpact
    DocImpact
    APIImpact
    
    Conflicts:
    	glance/tests/unit/v2/test_images_resource.py
    
    Conflicts:
    	glance/api/v2/images.py
    
    Change-Id: Ieb03aaba887492819f9c58aa67f7acfcea81720e
    Closes-Bug: #1525915
    (cherry picked from commit e9e45baa9aaf58e69964419b6b4fb2048d115a0c)