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This task is used for configuring the VM's NICs.

Till now the injected files were decoded in the tmp directory of the
instance. We did this because we used to chroot to install the files
with correct ownership. Since chrooting in abandoned, there is no need
to do this any more.

This is needed because piping the dumpfs command with head will
trigger a SIGPIPE.

Use heuristic methods to detect mandatory image properties if missing.

This resolves #50

Resizing of a xfs file system is performed in FilesystemResizeMounted
configuration task.

If no image properties are defined, then do not run any configuration
task. Prior to this commit, the system would fail if no image
properties were present.

Resizing of a btrfs file system is performed in FilesystemResizeMounted
configuration task.

If /etc/fstab is missing do not mount any other partition than the
root partition but do not fail. There are distros like CoreOS that
do not contain an `/etc/fstab'.

This parameter can be used instead of img_passwd to directly inject a
password hash in the shadow file of the instance. This is applicable
only to Unix images.

This resolves #36

Till now, half of the variable names that referred to passwords contained
PASSWORD in their name and half contained PASSWD

When searching a windows image for the presence of an answer file,
make sure that Autounattend.xml is also considered as a valid answer
file.

Update the unattend.xml file to support Desktop variants of Microsoft
Windows.

 * Rename the image property INSTALL_DEFAULT_UNATTEND to
   IGNORE_UNATTEND.
 * Add documentation about this property

Newer versions of automake raise errors when multiple AM_INIT_AUTOMAKE
entries are defined.

This is to allow multi-line base64 encoded data in the "contents"
attribute of img_personality.

Fixes #51

If the parameter is not defined then the ChangePassword task will not
run at all.

This resolves #34

In order to extend a partition we need to remove and recreate it. If the
partition was misaligned then the image is to blame. snf-image is not
allowed to change the starting sector of the partition since this will
destroy the file system it hosts. In order to make sure this does never
happen we need to set the sector alignment multiple to 1.

Add support for resizing UFS file systems of NetBSD OSes

When enlarging OpenBSD partitions, round them up to multiples of 16512
which is the default fs blocksize. This is what OpenBSD's disklabel
does when creating partitions.

The mapping we used would fail in some cases. If a BSD partition
has the same boundaries with an MBR one, the kernel will not map it
onto a different block device. As a result, partition 'a' is sometimes
mapped onto /dev/sda1 and sometimes onto /dev/sda5.

Add an input option in disklabel.py to print the partition mapping the
Linux kernel would do on the disklabel.

 * Implement new NetBSDDisklabel and FreeBSDDisklabel classes that
   subclass BSDDisklabel class.
 * Add methods for enlarging the disk and the last partition in
   NetBSDDisklabel

This method converts an LBA address to CHS. Different BSD systems do
this in different ways:

 * NetBSD uses LBA-Assisted translation but OpenBSD does not.
 * For addresses over 8GB where CHS will overflow, OpenBSD will assign
   a fixed value on all 3 CHS fields when NetBSD will do this only for
   the cylinders field.

Make PartitionTableBase and DisklabelBase classes abstract by using the
ABCMeta metaclass of the abc module

 * Add missing method comments
 * Inline all MBR fields comments
 * Print partition type in hex

Add basic support for traditional BSD disklabels

 * Create a DisklabelBase class that the two Disklabel classes will
   subclass
 * Move common code to the base class
 * Cleanup the derived classes

Create a PartitionTableBase class that will host the common code for the
PartitionTable classes of the two Disklabel classes.

Add the partition table fields and the format field for the BSDDisklabel
class. The body of the class is not implemented yet.

Add a main() function that works as entry point and rephrase the help
text in some input options.