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This backend type can be used if we want snf-image to configure the
VM disk without first copying an image to it. This is useful for
cases were the VM disk is already populated before snf-image runs.

Newer arch linux systems use this file to assign a hostname. If the
file is present and not empty, then use it.

 * Fix distro detection code to detect arch linux systems
 * Fix AssighHostname hook to successfully assign the host name on
   arch linux systems

This program is used to output info and error messages from the host.

This programm will get the stderr file as input and it will create a
json image-error msg

snf-image-host can output info messages using the log_info function.

Change msg field to messages in monitoring messages with type
image-helper and subtype error or warning. The new field is a list
of strings.

Change sys.stdin.readline with os.read

Progress monitor program needs to know the instance name, which is
provided by ganeti_os_main.

A `{' was missing in the beginning of the json string of the message
with type `error'.

This program transforms raw helper monitor messages into json strings
under very strict rules. This reduces security concerns since the
helper VM output cannot be trusted.

 * Make sure `img_format', `img_passwd' and `img_id' are passed
 * If format is `diskdump', require the `img_properties` parameter

Defining EXCLUDE_TASK_DeleteSSHKeys is the same as defining
EXCLUDE_TASK_DELETESSHKEYS

 * 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.