Re: [Libvir] New style CDROM config in Xen 3.0.3

So in a recent change to xen-unstable.hg the way CDROM devices are configured for HVM guests changed. They are now treated as regular IDE devices, and a CDROM is signified by presence of ':cdrom' suffix on the device name http://lists.xensource.com/archives/html/xen-devel/2006-08/msg00369.html libvirt obviously needs to support both this new style config, and the old (<= 3.0.2) style configs. Thus I requested addition of 'xend_config_format' attribute in the /xend/node SEXPR data from XenD. Christian recently committed this patch, so we can now support both CDROM style configs in libvirt. I am attaching a patch to implement this support - basically it touches xend_internal.c to fix XML->SEXPR conversion, and xml.c to fix SEXPR->XML conversion. Then this is corresponding additions to the unit tests to validate the new code, and also validate that I didn't break existing code. I am attaching the patches, but I don't intend to commit them to libvirt just yet because I don't actually have the new 3.0.3 xend running on my test systems fully yet. If anyone is using 3.0.3 any testing would be appreciated, otherwise I aim to test this towards end of next week.