fix output refers to sensitive values

[6aKa]

Fix for issue #319

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[bharathkkb]

Thanks for the PR @6aKa. Please sign the CLA.
Also it is worth noting that this module is not meant to be directly used as the root module and it is only in root modules we need to mark outputs as sensitive. We can still accept this since we have this for the mysql.

[6aKa]

I catch error when try use module from terragrunt.

terraform {
  source = "tfr:///GoogleCloudPlatform/sql-db/google//modules/postgresql//.?version=11.0.0"
}
inputs = {
  name                               = "test-db"
  random_instance_name = true
  ...
}

Because terragrunt catch all output from terraform module.

[comment-bot-dev]

@6aKa
Thanks for the PR! 🚀
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