Foresee all OSCustomizationSpec events

A handy way to configure the guest OS of a new VM, is to use the Guest OS Customization Spec.
But note that this customisation might take a while, and will most probably include a reboot.

The best way to wait until that customisation has been completed is to monitor for the correct events. Don’t forget to also include the possibility that the customisation might fail.

$vm = New-VM @sVM
$now = Get-Date 
$eventTypes = Get-VIEvent -Entity $vm -Start $now | %{$_.GetType().Name}
while($eventTypes -notcontains 'CustomizationSucceeded' -and 
      $eventTypes -notcontains 'CustomizationFailed’){
  Start-Sleep -Seconds 5
  $eventTypes = Get-VIEvent -Entity $vm -Start $now | %{$_.GetType().Name}
}