provider/azurerm: Support AzureRM Sql Database DataWarehouse
provider/azurerm: Support AzureRM Sql Database DataWarehouse

Fixes #9194

Removes the validation for the types and adds an acceptance test to make
sure we get a successful Sql Database created

```
% make testacc TEST=./builtin/providers/azurerm TESTARGS='-run=TestAccAzureRMSqlDatabase_datawarehouse'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/10/03 21:57:16 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/azurerm -v
-run=TestAccAzureRMSqlDatabase_datawarehouse -timeout 120m
=== RUN   TestAccAzureRMSqlDatabase_datawarehouse
--- PASS: TestAccAzureRMSqlDatabase_datawarehouse (307.95s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/azurerm307.963s
```

thiagocaiubi/terraform-provider-azurerm,sebastus/terraform-provider-azurerm,sebastus/terraform-provider-azurerm,abhijeetgaiha/terraform-provider-azurerm,thiagocaiubi/terraform-provider-azurerm,sebastus/terraform-provider-azurerm,thiagocaiubi/terraform-provider-azurerm,abhijeetgaiha/terraform-provider-azurerm,abhijeetgaiha/terraform-provider-azurerm