Document how and when we update the assets (kernel + rootfs images)

[jodh-intel]

Each OBS release [1] results in 2 new package versions for the assets used by the hypervisor:

• linux-container for the kernel
• clear-containers-image for the rootfs image

We need to document in the wiki [2]:

1. Where the sources for these packages are.
2. How they are built.

We specifically also need to document the process for creating updated packages triggered by a CVE security fix in either of the assets.

Admins will also probably want to know roughly how frequent the updates are going to be so we need to explain:

• weekly builds (with new asset versions).
• CVE security fix releases (potentailly any number of releases at any time).

We should also encourage all users to keep their systems updated to ensure they are using the latest assets versions. That will involve explaining how to check if their assets are not current which is in fact a two-part operation:

1. Update your system (apt-get update, etc).
2. Potentially restart any long-running containers (see [3]).

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[1] - http://download.opensuse.org/repositories/home:/clearcontainers:/clear-containers-3/
[2] - Initially, but maybe this should become an in-tree document at some point.
[3] - #631