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Make sure the cached unattend xml file gets deleted after sysprep

This is needed because in some cases, the init could exit before the
system shut down causing a KERNEL PANIC.

Modify pithcat to be able to parse and work with URLs of the form:
`pithosmap://hash/size' which are neeed for archipelagos.

Stratos Psomadakis suggested to shutdoen the helper VM using the `o'
Magic SsysRq key

Make sure local variables are defined as local before they get assigned.
Having variables get defined and assigned in one line like this:

local var=foo

can sometimes cause problems. For example, this line:

local var=$(false)

will return 0 and the script will not fail if set -x is defined.

snf-image-update-helper will only install a pkg retrieved from the
apt unless -p option is specified.

This can be used to enable or disable the version check between
snf-image-host and snf-image-helper at the end of the update-helper
script.

Using package caches to create the helper image is dangerous now that
snf-image-helper is automatically retrieved.

Use squeeze instead of stable

The files hosted in this directory will be added in the
/etc/apt/preferences.d directory of the helper image before multistrap
runs.

AssignHostname task did not search for Unattend.xml in a case
insensitive way.

Make sure that if log_error is executed like this:

log_error "text" "text"

The 2 arguments get merged before being fed to the monitoring system.

In image helper, check if decode-properties.py returned 0 and log
the error if this is not the case.

If unattend.xml is present in the windows image, use this one unless
USE_DEFAULT_UNATTEND is specified as an image property.

If an error occurs, the temporary helper image under
/var/lib/snf-image-helper should be removed.

Conflicts:

	snf-image-host/snf-image-update-helper.in

Fix a bug where the helper will not send a image-helper-error msg
if an error occures when running snf-image-helper main script and
not one of the configuration tasks.

Conflicts:

	snf-image-helper/common.sh

It should have been changed in commit 696deeec

Do not send through the monitor pipe the error messages. They may
contain internal sensitive information. Create a new report_error
function for sending errors through the monitoring pipe.

Conflicts:
	snf-image-host/create
	snf-image-host/snf-image-update-helper.in

Check if the users stated in the USERS image property do actually
exist.

snf-image-update-helper should check when creating a helper VM if
an snf-image-helper package was installed from an apt repository
through multistrap. If this is the case, snf-image-update-helper
should not complain about not finding the HELPER_PKG.

By default this directory is $(LOCALSTATEDIR)/cache/snf-image/helper