[Libvir] [PATCH] Fix cdrom connect/disconnect for qemu

[Cole Robinson]

The attached patch fixes cdrom changing for a live qemu guest. There
were a few issues preventing it from working:

1) It didn't anticipate no <source> block in the xml.
2) No support for ejecting the media
3) Small bug which prevented the running guest xml from being updated.

I've tested this via virt-manager, and now qemu and xen seem
to have parity wrt cdrom connect/disconnect.

Thanks,
Cole


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