tests/resource/aws_appautoscaling_policy: Ensure covering acceptance testing for DynamoDB index policy
tests/resource/aws_appautoscaling_policy: Ensure covering acceptance testing for DynamoDB index policy

Output from acceptance testing:

```
--- PASS: TestAccAWSAppautoScalingPolicy_dynamodb_index (46.12s)
--- PASS: TestAccAWSAppautoScalingPolicy_dynamodb_table (41.91s)
```

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