It used to be a function in util module

The machine hardware name fetched by `uname -m' should have been
stripped, and a --enable-kvm option should be added if the returned
executable was qemu-system-<arch>

On some systems it is kvm, on some others it is qemu-system-x86_64. On
32bit PC it is qemu-system-i386

This function is used to check if a specified libguestfs version is
smaller, greater or equal to the installed one

 * Prefix all private methods with _
 * Write missing docstrings
 * Move all public methods above the private ones
 * Add module docstrings where missing
 * Define source code encodings on all modules

The cow file when creating images or the temporary image file when
bundling the host system may be large. Allow the user to overwrite
the directory under which those files get created.

Add a new try_fail_repeat function that wraps cleanup system commands
and retries them if they fail. There are cases where commands like
dmsetup, umount and losetup -d may fail with device is busy. In most
of the cases, sleeping for halve a second and retrying does the job.

PBS has now bocome sh.

All image-creator components now output messages using an instance
of one of the output classes.

Also merge data_cleanup tasks with syspreps and did a major cleanup

All printing had to be reordered and now it is done from a central point.

The package is buggy and we can use pbs to do the same thing.