tests/resource/aws_iam_policy_attachment: Temporarily use expanded us…

…ers references

This change is both backwards (0.11) and forwards (0.12) compatible to allow the configuration on both versions. Eventually the temporary workaround will be removed when we switch the provider test configurations to 0.12-only syntax.

Previous output from Terraform 0.12 acceptance testing:

```
--- FAIL: TestAccAWSIAMPolicyAttachment_paginatedEntities (2.16s)
    testing.go:568: Step 0 error: errors during plan:

        Error: Incorrect attribute value type

          on /opt/teamcity-agent/temp/buildTmp/tf-test032782444/main.tf line 26:
          (source code not available)

        Inappropriate value for attribute "users": element 0: string required.
```

Output from Terraform 0.12 acceptance testing:

```
--- PASS: TestAccAWSIAMPolicyAttachment_paginatedEntities (57.78s)
```

aws/resource_aws_iam_policy_attachment_test.go

@@ -352,7 +352,109 @@ EOF
 }
 resource "aws_iam_policy_attachment" "test-paginated-attach" {
 	name = "%s"
-	users = ["${aws_iam_user.user.*.name}"]
 	policy_arn = "${aws_iam_policy.policy.arn}"
+	users = [
+		"${aws_iam_user.user.*.name[0]}",
+		"${aws_iam_user.user.*.name[1]}",
+		"${aws_iam_user.user.*.name[2]}",
+		"${aws_iam_user.user.*.name[3]}",
+		"${aws_iam_user.user.*.name[4]}",
+		"${aws_iam_user.user.*.name[5]}",
+		"${aws_iam_user.user.*.name[6]}",
+		"${aws_iam_user.user.*.name[7]}",
+		"${aws_iam_user.user.*.name[8]}",
+		"${aws_iam_user.user.*.name[9]}",
+		"${aws_iam_user.user.*.name[10]}",
+		"${aws_iam_user.user.*.name[11]}",
+		"${aws_iam_user.user.*.name[12]}",
+		"${aws_iam_user.user.*.name[13]}",
+		"${aws_iam_user.user.*.name[14]}",
+		"${aws_iam_user.user.*.name[15]}",
+		"${aws_iam_user.user.*.name[16]}",
+		"${aws_iam_user.user.*.name[17]}",
+		"${aws_iam_user.user.*.name[18]}",
+		"${aws_iam_user.user.*.name[19]}",
+		"${aws_iam_user.user.*.name[20]}",
+		"${aws_iam_user.user.*.name[21]}",
+		"${aws_iam_user.user.*.name[22]}",
+		"${aws_iam_user.user.*.name[23]}",
+		"${aws_iam_user.user.*.name[24]}",
+		"${aws_iam_user.user.*.name[25]}",
+		"${aws_iam_user.user.*.name[26]}",
+		"${aws_iam_user.user.*.name[27]}",
+		"${aws_iam_user.user.*.name[28]}",
+		"${aws_iam_user.user.*.name[29]}",
+		"${aws_iam_user.user.*.name[30]}",
+		"${aws_iam_user.user.*.name[31]}",
+		"${aws_iam_user.user.*.name[32]}",
+		"${aws_iam_user.user.*.name[33]}",
+		"${aws_iam_user.user.*.name[34]}",
+		"${aws_iam_user.user.*.name[35]}",
+		"${aws_iam_user.user.*.name[36]}",
+		"${aws_iam_user.user.*.name[37]}",
+		"${aws_iam_user.user.*.name[38]}",
+		"${aws_iam_user.user.*.name[39]}",
+		"${aws_iam_user.user.*.name[40]}",
+		"${aws_iam_user.user.*.name[41]}",
+		"${aws_iam_user.user.*.name[42]}",
+		"${aws_iam_user.user.*.name[43]}",
+		"${aws_iam_user.user.*.name[44]}",
+		"${aws_iam_user.user.*.name[45]}",
+		"${aws_iam_user.user.*.name[46]}",
+		"${aws_iam_user.user.*.name[47]}",
+		"${aws_iam_user.user.*.name[48]}",
+		"${aws_iam_user.user.*.name[49]}",
+		"${aws_iam_user.user.*.name[50]}",
+		"${aws_iam_user.user.*.name[51]}",
+		"${aws_iam_user.user.*.name[52]}",
+		"${aws_iam_user.user.*.name[53]}",
+		"${aws_iam_user.user.*.name[54]}",
+		"${aws_iam_user.user.*.name[55]}",
+		"${aws_iam_user.user.*.name[56]}",
+		"${aws_iam_user.user.*.name[57]}",
+		"${aws_iam_user.user.*.name[58]}",
+		"${aws_iam_user.user.*.name[59]}",
+		"${aws_iam_user.user.*.name[60]}",
+		"${aws_iam_user.user.*.name[61]}",
+		"${aws_iam_user.user.*.name[62]}",
+		"${aws_iam_user.user.*.name[63]}",
+		"${aws_iam_user.user.*.name[64]}",
+		"${aws_iam_user.user.*.name[65]}",
+		"${aws_iam_user.user.*.name[66]}",
+		"${aws_iam_user.user.*.name[67]}",
+		"${aws_iam_user.user.*.name[68]}",
+		"${aws_iam_user.user.*.name[69]}",
+		"${aws_iam_user.user.*.name[70]}",
+		"${aws_iam_user.user.*.name[71]}",
+		"${aws_iam_user.user.*.name[72]}",
+		"${aws_iam_user.user.*.name[73]}",
+		"${aws_iam_user.user.*.name[74]}",
+		"${aws_iam_user.user.*.name[75]}",
+		"${aws_iam_user.user.*.name[76]}",
+		"${aws_iam_user.user.*.name[77]}",
+		"${aws_iam_user.user.*.name[78]}",
+		"${aws_iam_user.user.*.name[79]}",
+		"${aws_iam_user.user.*.name[80]}",
+		"${aws_iam_user.user.*.name[81]}",
+		"${aws_iam_user.user.*.name[82]}",
+		"${aws_iam_user.user.*.name[83]}",
+		"${aws_iam_user.user.*.name[84]}",
+		"${aws_iam_user.user.*.name[85]}",
+		"${aws_iam_user.user.*.name[86]}",
+		"${aws_iam_user.user.*.name[87]}",
+		"${aws_iam_user.user.*.name[88]}",
+		"${aws_iam_user.user.*.name[89]}",
+		"${aws_iam_user.user.*.name[90]}",
+		"${aws_iam_user.user.*.name[91]}",
+		"${aws_iam_user.user.*.name[92]}",
+		"${aws_iam_user.user.*.name[93]}",
+		"${aws_iam_user.user.*.name[94]}",
+		"${aws_iam_user.user.*.name[95]}",
+		"${aws_iam_user.user.*.name[96]}",
+		"${aws_iam_user.user.*.name[97]}",
+		"${aws_iam_user.user.*.name[98]}",
+		"${aws_iam_user.user.*.name[99]}",
+		"${aws_iam_user.user.*.name[100]}",
+	]
 }`, userNamePrefix, policyName, attachmentName)
 }