New tool: virt-list-filesystems

New tool: virt-list-filesystems

Use this program as a convenient way to list the filesystems
available in a disk image or libvirt guest.

Example:

  $ virt-list-filesystems /dev/vg_trick/Debian5x64
  /dev/debian5x64/home
  /dev/debian5x64/root
  /dev/debian5x64/tmp
  /dev/debian5x64/usr
  /dev/debian5x64/var
  /dev/sda1

This is designed to make it easier for novices to use guestfish
and guestmount.  In particular with guestmount this acts as a way
to get a list of filesystems to use with the '-m' option.  ie:

  $ virt-list-filesystems unknowndisk.img
  /dev/sda1
  /dev/sda2
  $ guestmount -a unknowndisk.img -m /dev/sda1 /mnt