* vendor updates
- updating to v21.3.0 of github.com/Azure/azure-sdk-for-go
- updating to v10.15.4 of github.com/Azure/go-autorest
- vendoring github.com/hashicorp/go-azure-helpers @ 0.1.1
* backend/azurerm: refactoring to use the new auth package
- refactoring the backend to use a shared client via the new auth package
- adding tests covering both Service Principal and Access Key auth
- support for authenticating using a proxy
- rewriting the backend documentation to include examples of both authentication types
* switching to use the build-in logging function
* documenting it's also possible to retrieve the access key from an env var
* provider/azurerm: Bump AzureRM SDK to v8.0.1-beta
* provider/azurerm: Renaming SDK packages as per MSFT updates
* Bump azurerm sdk 8.0.1 (#12076)
* Updating the constructors to match the updated types
* Updating the Redis Client name
* ObjectID is now a string
* Updating to match the new Storage API specs
Tom Harvey