[Libguestfs] [PATCH 3/3 VERSION 2] Add 'virt-rescue' command.

Slightly updated patch, which just changes the documentation. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/