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libgusetfs tools and virt-sparsify excerpt: Don't forget the virt-sparsify tool again

libguestfs tools and virt-sparsify

I missed the tool so much that I've been re-google for key word "qcow2 compress", "qcow2 space claim", "libguestfs compress" and etc. for a whole day!!!

Here's the manpage: http://libguestfs.org/virt-sparsify.1.html

It is much better than the pure qemu-img convert -c -f a.qcow2 -O qcow2 compressed_a.qcow2 command.

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