Event extension (depends on #269)

Added vm_suspend[_req] event registration for power tests

Update that should enable an extended handling of the events
* host_analysis_request
* host_analysis_complete
* vm_reset_req
* vm_reset
* vm_suspend_req
* vm_suspend
* vm_settings_change
* vm_template_create_complete
* vm_retired
* 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