[libvirt] Xen device section defaults miss name='qemu'

[Christian Ehrhardt]

​Not sure how stupid it might be so clearly just a very humble RFC, but the
following seems to work for me:
Therefore no nicely polished patch, but just inline diff

--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -367,8 +367,9 @@
         int actual_type = virStorageSourceGetActualType(disk->src);
         int format = virDomainDiskGetFormat(disk);

-        /* for network-based disks, set 'qemu' as the default driver */
-        if (actual_type == VIR_STORAGE_TYPE_NETWORK) {
+        /* for network-based disk and cdrom, set 'qemu' as the default
driver */
+        if (actual_type == VIR_STORAGE_TYPE_NETWORK ||
+            disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM) {
             if (!virDomainDiskGetDriver(disk) &&
                 virDomainDiskSetDriver(disk, "qemu") < 0)
                 return -1;

Opinions?
If it seems remotely reasonable I'm totally fine submitting a patch in more
style with proper headers and such.
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