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 * Change the monitor message type names once again (hope this is
   the final version)
 * Pass -u (unbuffered) to sed to retain the actual output order in
   the log file
 * Fix a bug in helper code where the starting `{' was missing from
   the monitoring messages

The latter is part of gnu coreutils.

 * Remove id field in the notifications (what was left)
 * Make copy-monitor.py use the already opened pipe file descriptor
   instead of reopening the file
 * Let bash choose the file descriptor instead of specifying one when
   opening the pipe file

 * Add nanoseconds field in timestamp
 * Remove id field in the notifications
 * Fix cleanup code

This commit extendes the monitoring mechanism to include events from
snf-image-helper.

Trying to add a logical swap partition after an already existing logical
partition triggered an error in parted, because between logical partitions
a gap of at least 1 sector needs to be present.

Add a utility initially written by vkoukis for monitoring the image
copy. This utility outputs notifications to a named pipe. An external
program can get informed for the image deployment progress by reading
the notifications from this named pipe. The monitoring mechanism
will be extended in the future to have other snf-image subparts
output notification to this named pipe too.

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.