More events added:

* vm_snapshot_create_complete
* vm_snapshot_create_request
* vm_snapshot_create_started
* vm_guest_reboot
* vm_guest_reboot_req
* vm_guest_shutdown
* vm_guest_shutdown_req
* vm_create_complete
* vm_delete_req
* vm_clone_start
* vm_clone_complete
* vm_standby_guest
* vm_standby_guest_req