[libvirt] tweak a format string and add a test

[Daniel Veillard]

On Mon, Mar 02, 2009 at 07:38:50PM +0100, Jim Meyering wrote:
> I'm about to commit these (like what I already posted,
> but now the test kills libvirtd):

  okay, it's always annoying to change virsh output, though,
  ACK

Daniel

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Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
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