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

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