[libvirt] [PATCH] Fix ejecting cdroms with latest qemu syntax

[Cole Robinson]

Originally, ejecting a cdrom from a qemu guest entailed
passing 'eject cdrom' to the monitor. But since qemu
added the -drive option, more than one cdrom can be
specified, so just using 'cdrom' isn't explicit enough.

The attached patch updates media change/eject to use
the current qemu syntax. The new generated commands
look something like "eject ide0-cd1", with the name
derived from device target and bus type.

While I was in there I added support for inserting/
ejecting media from scsi cdroms and floppy devices.

This is built around my previous two patches:
- Fix cd eject segfault
- Attempt to detect cdrom change failures

Thanks,
Cole

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