docs: def get_customizationspec_ref(si, customization_spec_name):
      '''
      Get a reference to a VMware customization spec for the purposes of customizing a clone
  
      si
          ServiceInstance for the vSphere or ESXi server (see get_service_instance)
  
      customization_spec_name
          Name of the customization spec
  
      '''
      customization_spec_name = si.content.customizationSpecManager.GetCustomizationSpec(name=customization_spec_name)
      return customization_spec_name