test/resource/aws_iam_role: Update sweeper prefix list (#10369)
test/resource/aws_iam_role: Update sweeper prefix list (#10369)

While testing a few IAM roles a number of lingering IAM roles with the
prefix test-role were found in our testing account. This change updates
the list of known test prefixes to help clean up after acceptance tests.

```
2019/10/03 13:46:15 [DEBUG] Deleting IAM Role: test-role-czb6pl0e34
2019/10/03 13:46:16 [DEBUG] Deleting IAM Role: test-role-d0028y7qm1
2019/10/03 13:46:17 [DEBUG] Deleting IAM Role: test-role-dfynstp2p8
2019/10/03 13:46:18 [DEBUG] Deleting IAM Role: test-role-dwvcp903bo
2019/10/03 13:46:19 [DEBUG] Deleting IAM Role: test-role-ec2-8188536180317514030
2019/10/03 13:46:19 [DEBUG] Deleting IAM Role: test-role-ec2-8467891203856496364
2019/10/03 13:46:20 [DEBUG] Deleting IAM Role: test-role-emlb90qlxy
2019/10/03 13:46:21 [DEBUG] Deleting IAM Role: test-role-eo1x8sj7ij
2019/10/03 13:46:22 [DEBUG] Deleting IAM Role: test-role-eossli2ess
2019/10/03 13:46:23 [DEBUG] Deleting IAM Role: test-role-epbkr7nb7d
2019/10/03 13:46:24 [DEBUG] Deleting IAM Role: test-role-fvouo0zuoy
2019/10/03 13:46:25 [DEBUG] Deleting IAM Role: test-role-fyjmcb703v
2019/10/03 13:46:26 [DEBUG] Deleting IAM Role: test-role-g1e6s24tr8
2019/10/03 13:46:27 [DEBUG] Deleting IAM Role: test-role-g42ffnpvwz
2019/10/03 13:46:28 [DEBUG] Deleting IAM Role: test-role-g4qj9febuf
2019/10/03 13:46:29 [DEBUG] Deleting IAM Role: test-role-gqfgutmca1
2019/10/03 13:46:29 [DEBUG] Deleting IAM Role: test-role-h2chl68vwk
2019/10/03 13:46:30 [DEBUG] Deleting IAM Role: test-role-h2kydpe683
2019/10/03 13:46:31 [DEBUG] Deleting IAM Role: test-role-hfqzllm960
2019/10/03 13:46:32 [DEBUG] Deleting IAM Role: test-role-ho2eipx9o6
2019/10/03 13:46:33 [DEBUG] Deleting IAM Role: test-role-htnsf4k67a
2019/10/03 13:46:34 [DEBUG] Deleting IAM Role: test-role-i9ypnhdhx0
2019/10/03 13:46:35 [DEBUG] Deleting IAM Role: test-role-ibazcx71wh
2019/10/03 13:46:36 [DEBUG] Deleting IAM Role: test-role-iept7yhxf3
```
kjmkznr/terraform-provider-aws,terraform-providers/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