qemu: ingore the transient domain state in fake reboot
qemu: ingore the transient domain state in fake reboot

When action for 'on_poweroff' is set to 'restart', 'fake reboot'
is triggered and qemu shutdown state is transient. Domain state
need not to be changed and events not sent in this case.

Fixes: 4ffc807214cb80086d57e1d3e7b60959a41d2874
Signed-off-by: Zhenzhong Duan <0a6aad489bf65c23415e55e6bee033aa588b7328@intel.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,crobinso/libvirt,crobinso/libvirt,crobinso/libvirt,nertpinx/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,zippy2/libvirt,jfehlig/libvirt,olafhering/libvirt,nertpinx/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt