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snf-image will detect at runtime if pithos backend is installed

snf-image-helper by default uses it's own version of unattend.xml file,
but if UNATTEND variable is specified then it will use the one provided
by snf-image-host.

Fix a bug where the partition that should be resized in some cases
was computed in a wrong way

This task is used to set up the swap partition previously created by
FixPartitionTable task and to add a swap entry in the instances fstab
file.

snf-image-host will make use the external progress monitor program
if the PROGRESS_MONITOR variable is not empty. This way progress
monitor can be enable or disabled by just overwriting the aforementioned
variable in the defaults file.

This file is used to check if the cache file contains every package
defined in HELPER_EXTRA_PKGS.

The interface in get_last_partition function in the helpers common.sh
has changed but not all needed tasks where updated.

Now FixPartitionTable task can enlarge logical partitions

* If -y is not specified and a cache file is found, ask the user before
using it.
* "Fix" the -c option's behaviour. With this commit, if -c is applied,
the system will use the provided cache file if present and will do a
debootstrap if the file does not exist. The result of debootstrap will
be saved in the default cache file provided by the HELPER_CACHE_FILE
variable. This way, we do not need to provide an extra "disable cache
file option". One can run the program with -c "" to get this behaviour.

Update the windows registry in Unattend.xml to force an automatic
Windows Update

This bug was introduced in commit 88262dba that added pipefail bash
option to all configuration tasks

This is needed because common.sh contains functions that use pipes,
and the script should fail if any command fails.

The system's architecture is needed by debootstrap.

When get_distro and get_base_distro do not detect the linux distribution
a warning is triggered.

AssignHostname fails if the distribution is not known.

The bug had to do with the presence of a space character right after =
in a variable assignment.

This way we can restrict the size of the files created by the helper.

The device argument in tunefs command was erroneously ommited.

Check if the filesystem is clean, and fail if not.