copy_from policy not enforced during update

[Yanis Guenane]

During the image-create action, the copy_from policy is properly enforced. But it is not during the update process.

Meaning, a non-authorized user can create an empty image and then update it with the --copy-from option even if policy.json says it othewise.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/60886

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/60886
Committed: http://github.com/openstack/glance/commit/6354b347262febb83b4e26f61cdfe0ab3dcedb4f
Submitter: Jenkins
Branch: master

commit 6354b347262febb83b4e26f61cdfe0ab3dcedb4f
Author: Yanis Guenane <email address hidden>
Date: Mon Dec 9 17:25:35 2013 +0000

    Enforce copy_from policy during image-update

    The enforcement of the copy_from policy is missing during update allowing
    every user to do this action no matter what is defined in the policy.json

    Change-Id: Iecf11bdf220b37d9ecbb6fc686214d14acf1d3dd
    Closes-bug: #1259241