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
```
Some azurerm resources store resource_group_name in lowercase only.
Other store resource_group_name using lower and upper case.
Ensure that all test cases use capitalisation in resource_group_name
to find errors in diffs due to capitalisation.
Some resource_group_name were refactored to match naming scheme
across the azurerm tests.
Paul Stack