Can not define only image creator can delete the image

[Lin, Bo-Chun]

We want to define that the image only can be deleted by admin or image creator.
So we modify the policy file as below:
{
    "context_is_admin": "role:admin",
    "admin_or_user": "is_admin:True or user_id:%(user_id)s",
    "default": "",
    "manage_image_cache": "role:admin",
    "delete_image": "rule:admin_or_user"
}

But it does not work because it does not pass the user_id or other detail to the policy checker.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/57913

[Erno Kuvaja (jokke)]

Old and abandoned.

[Ian Cordasco (icordasc)]

See https://review.openstack.org/#/c/146651/