Bug fixes and documentation updates

Do not search for specific words in it. The messages may be in a
language other than English. Focus on the Numbers.

Do not use format=raw in the -drive option of KVM when booting the
Windows VM. The format could also be qcow2 if the original input media
is a regular file.

Populate this section with instructions on how to troubleshoot
libguestfs's launch failures.

Detect Kubuntu, Lubuntu and Xubuntu

 * Add instructions for CentOS 7
 * Use curl in favor of wget on Fedora and CentOS systems.

When bundling a host, make sure that the UUIDs and the Labels of the
original file systems are preserved.

Signed-off-by: Nikos Skalkotos <skalkoto@grnet.gr>

Conflicts:
	debian/changelog

Fix a bug in host-bundling operation were in some cases the computed
new image size was wrong.

Signed-off-by: Nikos Skalkotos <skalkoto@grnet.gr>

Older versions of qemu-img do not accept a '--output json' option

Signed-off-by: Nikos Skalkotos <skalkoto@grnet.gr>

The printed name of the sysprep tasks is constructed from the method
name by replacing the _ with " ". This can be used to overwrite it.

If you print the snapshotting message before disk.file is referenced,
you may end up outputting messages like this:

Snapshotting media source ... Examining source media `<image_file>' ...

Instead of:

Examining source media `<image_file>' ... looks like a block device
Snapshotting media source ... done

If you are a regular user, some root commands like modprobe may not be
in your path.

This exception does not exist in python 2.x

Start by waiting for 5sec before retrying and double the interval
after each retry.

The original value was 5min but was rather small. In Desktop versions
of windows the VirtIO installation may take longer.

When the button is pressed it displays further information about an
installed VirtIO driver.

Signed-off-by: Nikos Skalkotos <skalkoto@grnet.gr>

Feature image format support

Make sure the guestfs VM is killed before we launch the VM that
installs the VirtIO drivers.

snf-image-creator can work with different image formats nowadays.