code: func osDiskStorageBlobURL(account *storage.AccountProperties, vmName string) string {
  	containerURL := osDiskStorageContainerURL(account, vmName) // has trailing slash
  	blobName := fmt.Sprintf(fmtOSDiskBlobName, vmName)
  	return containerURL + blobName
  }
docs: // osDiskStorageBlobURL gives the full url of the VHD blob where the OS disk for
  // the given VM should be stored.