Fail if the network scripts are called with any positional arguments.
Till now, they were silently ignored.

This can be used to define an action for the default NIC that
Ganeti will attach to an instance if none of the --net and --no-nics
input arguments are defined on the instance creation command.

This resolves #90

Add a new auth_keys OS parameter

This parameter can be used to inject authorization keys to the VM for
the same users for whom a password change will be performed.

Prior to this commit, the same functionality could be achieved by
using the img_personality parameter to append the needed authorized_keys
files to the instance, but this is not the correct way to do it. Only
snf-image which does the deployment may know the actual path to the
authorized keys files.

Conflicts:
	docs/version.py
	version
	version.m4

Check the content of IMG_FORMAT variable. Not just the presence.

This resolves #95

Hotfix 0.20.2

v0.20, that added userspace disk URI support, did not implement the
support for image copying. This made URIs useful only in conjunction
with the null backend. In order to overcome this and until we have a
better solution we'll map the URIs to NBD block devices.

Add conv=notrunc when copying images to disks. If the disk-template
is file, using dd to copy the image into the disk would truncate the
disk.

This bug was introduced in version 0.20 where support for disk URIs
was added. Prior to that, all file disks were always losetup-ed.

Conflicts:
	docs/version.py
	version
	version.m4

If you try snf-image-update-helper in wheezy you'll get a
"no properly formatted MD5 checksum lines found" bug, because of a
sed command that will trim 2 spaces into 1.

Create a separate LICENSE file

Fix path name in snf-image-update-helper manpage

snf-image-update-helper will check the MD5 sum of the downloaded helper
image file against the one found inside the downloaded .md5sum file.
Before doing this, replace the name found inside the .md5sum file with
the one of the downloaded image. They may be different due to the fact
that curl will construct the file name from the URL when downloading.
Till now, we used to put the name of the cdn.dev.grnet.gr URL inside the
md5sum file instead of the actual one.

Add instructions for Ubuntu 16.04 and add a deprecation warning for
the CenOS instructions.

This task is used when deploying Linux instances to alter the
content of `/etc/machine-id`. This file contains an ID that is supposed
to be globally unique. When deploying an image it is better to
regenerate a random new one to assure the uniqueness. For more info
check:

https://www.freedesktop.org/software/systemd/man/machine-id.html

Update the architecture documentation to reflect the current state of
the configuration tasks.

Add support for Network Manager

Before executing a network configuration script, print its argument to
have them logged.

Introduce the new NM_NETWORKING image property that will force the
creation of Network Manager configuration files if defined

Rename debian.sh to ifupdown.sh and redhat.sh to ifcfg.sh. This is done
to make things more clear in case we add more network drivers that do
apply to Debian and RedHat like a driver for NetworkManager.

* Fix a list that was parsed incorrect
* Make some links with name "here", "diskdump", "md5sum" and "metadata"
  anonymous, so that sphinx stops complaining that those names are
  defined multiple times.