Add a section on how to use snf-image-creator on non-raw format images

If qemu catches a signal, it terminates with 0 and prints a message in
stderr. Try to detect if the process has been terminated by a signal
by examining the stderr.

When the user picks a directory that contains VirtIO drivers, show him
the version of the discovered drivers in the confirmation box.

When working in wizard mode, give the user the ability to revert the
installation of the VirtIO drivers.

Don't treat shrink as a seperated task. Add it in the syspreps menu.

Change the sysprep enabling and disabling mechanism to always work
correct. The previous implementation was buggy and would erroneously
"remember" the executed syspreps on a reset.

Use _add_cleanup and _cleanup in do_sysprep

This is handy because this way we don't need to unlock the
Administrator account if it is locked. Any user that is in the
Administrators group can do the job.

Better handle the case where shrink querymax does not return any
reclaimable space.

Relative IDs are safer. The Administrator's RID is always 500. The
name may change.

There were cases where a FatalError exception was constructed but never
raised

Fix a bug that affects newer versions of libguestfs where the handler
is erroneously closed in disable_guestfs

In Windows, when enumerating active users, also enumerate users that
are members of the Administrators group.

Import the module itself and not every single constant that is
defined there.

This can be used to fetch a registry node by defining a registry path

 * Cleanup Wizard and WizardPage classes in dialog_wizard
 * Fix various pylint warnings

Feature VirtIO installation.

Automatically install or upgrade the VirtIO drivers on Windows images.
This resolves #7.

Add a page in the dialog wizard that displays the current state of
the VirtIO drivers of the image and allow the user to update the
installed VirtIO drivers. This page will only be shown if the media
hosts a Windows image.

If this is enabled, the program will try to install the specified VirtIO
drivers to the image.

The sysprep parameters with the hidden attribute enabled are not
displayed to the user.

Add a mechanism in OSBase to add cleanup jobs. Use this mechanism to
cleanup the VirtIO drivers installation.

Add a method for disabling the first-logon animation. This will make
Administrator login faster if the Administrator account was previously
locked.

This is needed if the Administrator account is locked

This can be used to check if the media mounting was successful

Do not install and uninstall the winexe service in every single
execution of vm.rexec(). Only uninstall the service after executing the
last command which is either the sysprep or the shutdown command.

This used to be a sysprep but it is better if we disable it right away.
This is not needed for VMs and if this is enabled, the system will
hibernate on an ACPI shutdown event which will make the system
preparation to fail.

Make sure the guestfs handler is never cached in registry class. There
are cases where the guestfs handler is recreated in image class. The
registry code should always access the guestfs handler from the image
class and never from a local copy.

If we have verified that the OS in the Windows VM has booted, then wait
for a while to let it properly shut down even if an error occurred.

Display the return code and the stderr of the kvm process when the
customization VM dies unexpectendly

Do not upload the VirtIO drivers to %SystemRoot%\VirtIO. Use a temporary
directory for this job

Hide the powershell InstallDrivers.ps1 window if supported

Only install the drivers that where previously validated by
_fetch_virtio_drivers()

 * Detect the VirtIO driver type by the Device ID it refers to and not
   the catalog file name
 * Check if a driver is suitable for the input media by examining the
   TargetOSVersion field

When installing new drivers, make sure the old ones get uninstalled.

Rewrite the virtio_dir_check function that checks if a given directory
is indeed hosting VirtIO drivers.

Merge the Parameter menu entry with Sysprep and add a new entry for
installing VirtIO drivers. This will only be visible in Windows.