GitLab

Factor out the 'Interface' logic from usage and put it in a
dedicated section before installation.

Split the section `Image IDs and Storage backends' to decouple
the actual feature, the logic and the configuration. Feature and
logic is moved to a new section under 'Architecture' and the rest
remain under 'Usage'. Also add examples for each case.

The id now should contain the relative path from the HELPER_DIR to
the image filename, including the image-type extension if needed.

Add extra code to check if the image path ends up being outside the
IMAGE_DIR directory

This used to be file://

The variable should only exist in snf-image-update-helper. If the
user wants to overwrite the value, he should create it in
/etc/default/snf-image-update-helper

Also fix various typos

Add a section under Architecture about the Image Configuration Tasks

Fill in the usage section of the documentation

Fill in the architecture section of the documentation

Remove xen-linux-system-3.2.0-4-amd64 package and add packages from
the wheezy-helper suite of apt.dev.grnet.gr

It is no longer needed for the wheezy helper

Replace the meta packages with the real multistrap packages in
multistrap.conf

Put linux-image-amd64 and xen-linux-system-amd64 in the GRNet section
of multistrap.conf

Repo and version pinning does not work yet

Rename snf-image-create-fixed-helper script to snf-image-create-helper.
Also remove the command that will create a tar archive of the helper
files under /tmp