message: move hdinsights package for Go back under preview directory
diff: @@ -23,7 +23,7 @@ These settings apply only when `--tag=package-2018-06-preview --go` is specified
  Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
  ``` yaml $(tag) == 'package-2018-06-preview' && $(go)
  -output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2018-06-01-preview/$(namespace)
  +output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2018-06-01-preview/$(namespace)
  ```
  ### Tag: package-2015-03-preview and go
  