[libvirt] spec file: don't create networks/default.xml if it already exists

[Daniel P. Berrange]

On Wed, Jan 21, 2009 at 10:29:23AM +0000, Mark McLoughlin wrote:
> If you un-install libvirt and re-install it, you get a warning
> from the post-install script:
> 
>   Installing     : libvirt
>   ln: creating symbolic link `/etc/libvirt/qemu/networks/autostart/default.xml': File exists
> 
> See https://bugzilla.redhat.com/462011

ACK

Daniel
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