In response to the cdrom discussion going on today:

Attached is a port of a patch we have against 3.1

This patch plumbs the cdrom info through QEMU such that a QEMU monitor 
command may switch the  domain owning the physiical cdrom, such that an 
eject command on the guest command line will physically eject the drive 
door.

Monitor command example:
set_cdrom_owner 1 hdd
(for the time being the "hdd" parameter is a constant, as we only 
support a singular CDRom)

Signed-off-by: Ben Guthro <bguthro@virtualiron.com>
Signed-off-by: Joshua Nicholas <jnicholas@virtualiron.com>