qemu_process: add tray changed event to queue in refresh disks

qemu_process: add tray changed event to queue in refresh disks

There are some cases when the internal state of disks can change
without qemu sending events about it (e.g. a disk can close
during reset). In case this happens, we should emit an event
about the modified disk.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1824722#c20

Signed-off-by: Kristina Hanicova <khanicov@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>