provider/azurerm: Add cdn 'Origin type' argument

[hashibot]

This issue was originally opened by @razsha as hashicorp/terraform#13373. It was migrated here as part of the provider split. The original body of the issue is below.

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Hi,

Azure CDN Endpoint require choosing 'Origin type'.
Azure SDK GO : https://github.com/Azure/azure-sdk-for-go/blob/eb9eddfb7d680dca671221dba9e47626dd5fb464/arm/cdn/models.go
Azure Docs: https://docs.microsoft.com/en-us/azure/cdn/cdn-create-new-endpoint

Thanks,
Raz.

[tombuildsstuff]

Hey @razsha

Thanks for opening this issue :)

Taking a quick look at this issue - the Origin Type field appears to be an Azure Portal only feature. When looking at the API responses and the ARM Templates - I don't see any reference to it, instead they're just providing a friendlier UI to populate the origin.host_name / origin_host_header fields.

For example here's the ARM Templates for Custom Origin / Storage Account / Web Apps - which map to the API.

In the Models, the field Type refers to the Resource Manager type (in this case Microsoft.Cdn/Profiles/Endpoints) - and not the Origin Type.

Given all this I don't believe there's a field for us to add to the azurerm_cdn_endpoint resource - instead I believe we should update the documentation to refer to a Storage Account and a Web App - for which I've opened PR #149

Thanks!

[ghost]

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