Please, provide a fixed Cloud Image URL for Debian

[Martinx - ジェームズ <thiagocmartinsc@gmail.com>]

Guys,

 When we talk about Cloud Images for OpenStack, both Ubuntu and CentOS provides fixed URLs that never changes.

 This way, we can easily automate Glance to download images by demand, we can have new images, without adding new images into glance!

 Exemplifying:

 CentOS 6/7 fixed image URL:

 http://cloud.centos.org/centos/6/images/CentOS-6-x86_64-GenericCloud.qcow2c

 http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2c

 Ubuntu 16.04 fixed image URL:

 http://uec-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img

 Then, on Glance, here is how I'm adding those images:

  - glance image-create --location http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2c --name "CentOS 7 - 64-bit - Cloud Based Image" --is-public true --container-format bare --disk-format qcow2

  - glance image-create --location http://cloud.centos.org/centos/6/images/CentOS-6-x86_64-GenericCloud.qcow2c --name "CentOS 6 - 64-bit - Cloud Based Image" --is-public true --container-format bare --disk-format qcow2

 - glance image-create --location http://uec-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img --name "Ubuntu 16.04 LTS - Xenial Xerus - 64-bit - Cloud Based Image" --is-public true --container-format bare --disk-format qcow2

 I'm using my own Ansible automation to do this:

 https://github.com/sandvine-eng/svauto/blob/dev/ansible/roles/os_glance_images/tasks/main.yml

 The problem with Debian is that there is no fixed URL! Debian images disappears from time to time, which breaks my automation and that "Glance download by demand feature", like this:

 Debian 8.5 image URL:

 http://cdimage.debian.org/cdimage/openstack/8.5.0/debian-8.5.0-openstack-amd64.qcow2

 This image will be gone, soon as Debian launches 8.6.0!!! This is bad.

 So, can Debian provides something like this:

 http://cdimage.debian.org/cdimage/openstack/8/debian-8-openstack-amd64.qcow2 that always points to the latest stable release image of 8 series (Jessie)?

 For example, this:

 http://cloud.centos.org/centos/6/images/CentOS-6-x86_64-GenericCloud.qcow2c pointed to CentOS 6.7, but now, it is 6.8! Glance will download the new image, without any human action.

 Hope that Debian provides something similar!

Cheers!

Thiago