tests/resource/aws_rds_global_cluster: Bypass sweeper error in AWS GovCloud (US)
tests/resource/aws_rds_global_cluster: Bypass sweeper error in AWS GovCloud (US)

This partition does not currently support the RDS Global Cluster APIs.

Previous output from test sweeper in AWS GovCloud (US):

```console
$  go test ./aws -v -sweep=us-gov-west-1 -sweep-run=aws_rds_global_cluster -timeout 10h
...
2019/05/17 09:04:41 [ERR] error running (aws_rds_global_cluster): error retrieving RDS Global Clusters: InvalidParameterValue: Access Denied to API Version: APIGlobalDatabases
```

Output from test sweeper in AWS GovCloud (US):

```console
$  go test ./aws -v -sweep=us-gov-west-1 -sweep-run=aws_rds_global_cluster -timeout 10h
...
2019/05/17 09:08:01 Sweeper Tests ran:
  - aws_db_instance
  - aws_rds_cluster
  - aws_rds_global_cluster
```

kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,Ninir/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws