tests/resource/aws_launch_configuration: Refactor TestAccAWSLaunchConfiguration_withInstanceStoreAMI to use Amazon Linux and filter root device by instance-store
tests/resource/aws_launch_configuration: Refactor TestAccAWSLaunchConfiguration_withInstanceStoreAMI to use Amazon Linux and filter root device by instance-store

Output from acceptance testing:

```
--- PASS: TestAccAWSLaunchConfiguration_withInstanceStoreAMI (22.05s)
```

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