[libvirt] [PATCH] Install default storage pool

The attached patch adds a default pool definition to install with libvirt. The pool is a directory pool, hardcoded to use /var/lib/libvirt/images, though this is replaced with %{_localstatedir}/lib/libvirt/images if installing via rpm. Since /var/lib/libvirt/images may not exist if installing from tar.gz, the pool is set not to autostart by default via that method. This patch isn't ready to apply though, since there is one issue I don't know how to solve. We don't want every rpm upgrade to install the default pool, since we don't want the default to continually resurrect itself if a user explicitly deletes it. The default network handles this by checking if libvirtd has been installed. Since libvirtd and virtual network support were introduced around the same time, this makes sense. However for storage, I can't think of any simple check we can make. If we used the same as the default network, all f8 or f9 upgrades wouldn't install the default pool. I can't really think of anything to check, besides maybe doing some sort of time comparison on when /usr/share/libvirt/storage/default.xml was accessed. This code is just hardcoded to always add it. Any ideas? Thanks, Cole