backend/azurerm: support for authenticating via SAS Tokens

[tombuildsstuff]

This PR adds support for authenticating using a SAS Token, which allows limited access permissions to be used to access a Storage Account.

Needs to be merged after #19433

[alexsomesan]

Looks good.
Feel free to leave the defer stuff as is, if you prefer.

[tombuildsstuff]

Ignoring the known failing tests (which are fixed by #19441) - the tests otherwise look good:

[ps23]

Is possible to get a working example for that in .tf style?

terraform {
  backend "azurerm" {
    sas_token            = "xxx"
  }
}

Does it aim at the SAS token for the container (az storage container generate-sas ...) or the blob (az storage blob generate-sas ...) itself?

[abelal83]

I see this PR was merged before tf v0.11.11 was built but sas_token doesn't seem to be supported?

[tombuildsstuff]

@abelal83 unfortunately this PR is not included in v0.11.11 - it will ship as a part of Terraform 0.12

[ps23]

@abelal83 unfortunately this PR is not included in v0.11.11 - it will ship as a part of Terraform 0.12

Is it in the current alpha?

[abelal83]

That's great to hear @tombuildsstuff

[abelal83]

@ps23 don't think it is. I had a look at the build artifacts and sas key support didn't make it in.

[tombuildsstuff]

@ps23 it appears this shipped in Terraform 0.12 Alpha 3 (and later): https://github.com/hashicorp/terraform/blob/master/CHANGELOG.md#0120-alpha3-december-6-2018

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