rds-deployment-existing-ad * DSC failed * Error downloading https://raw.githubusercontent.com/Azure/azure-QuickStart-Templates/master/rds-deployment//Configuration.zip

rds-deployment-existing-ad https://github.com/Azure/azure-quickstart-templates/tree/master/rds-deployment-existing-ad/

### Issue Details
"message": "VM has reported a failure when processing extension 'sessionhost'. Error message: \"The DSC Extension failed to execute: Error downloading https://raw.githubusercontent.com/Azure/azure-QuickStart-Templates/master/rds-deployment//Configuration.zip after 29 attempts: The remote name could not be resolved: 'raw.githubusercontent.com'.

### Repro steps (*if necessary, delete otherwise*)
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Start with the rds-deployment-existing-ad template linked in the issue and trace the sessionhost DSC extension reference to Configuration.zip. Reproduce the deployment failure and verify whether the referenced download location can resolve and complete successfully; done means the extension no longer reports the download error.

Written by the indexing model from the issue text.