ProvisioningState type 
定义 ProvisioningState 的值。 
              KnownProvisioningState 可与 ProvisioningState 互换,此枚举包含服务支持的已知值。
服务支持的已知值
              Accepted 
              Creating 
              Deleting 
              Moving 
              Failed 
              Succeeded 
              ResolvingDNS 
              Canceled
type ProvisioningState = string