message: fix Go SDK codegen for containerservices
diff: @@ -26,7 +26,7 @@ Please also specify `--go-sdk-folder=<path to the root directory of your azure-s
  ``` yaml $(tag)=='package-2018-09-30-preview' && $(go)
  namespace: containerservice
  -output-folder: $(go-sdk-folder)/services/containerservice/mgmt/2018-09-30-preview/containerservice
  +output-folder: $(go-sdk-folder)/services/preview/containerservice/mgmt/2018-09-30-preview/containerservice
  ```
  ### Tag: package-2018-03 and go
  