[libvirt] libvirtd and LVM snapshots

[Nick Moffitt]

Cole Robinson:
> With the recently added COW support, we were trying to validate the
> passed logical volume's format, when there won't ever be one pulled
> from the xml (logical volumes don't have any valid format values).
> 
> Just remove this check, and let any validation in this manner be done
> by the actual call to 'lvcreate'.

I've applied this patch to my copy of 0.6.0 and it fixed snapshot
creation for me.  Thanks!

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