resource/aws_iam_role: Add permissions_boundary argument

[bflad]

Reference: #5174

Changes proposed in this pull request:

• Add permissions boundary support to aws_iam_role resource
• Minor refactoring for newer practices
• Support testing in AWS GovCloud (US)

Output from acceptance testing: AWS Commercial

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSIAMRole_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSIAMRole_ -timeout 120m
=== RUN   TestAccAWSIAMRole_importBasic
--- PASS: TestAccAWSIAMRole_importBasic (8.49s)
=== RUN   TestAccAWSIAMRole_basic
--- PASS: TestAccAWSIAMRole_basic (8.98s)
=== RUN   TestAccAWSIAMRole_basicWithDescription
--- PASS: TestAccAWSIAMRole_basicWithDescription (18.79s)
=== RUN   TestAccAWSIAMRole_namePrefix
--- PASS: TestAccAWSIAMRole_namePrefix (8.12s)
=== RUN   TestAccAWSIAMRole_testNameChange
--- PASS: TestAccAWSIAMRole_testNameChange (15.75s)
=== RUN   TestAccAWSIAMRole_badJSON
--- PASS: TestAccAWSIAMRole_badJSON (1.32s)
=== RUN   TestAccAWSIAMRole_force_detach_policies
--- PASS: TestAccAWSIAMRole_force_detach_policies (9.02s)
=== RUN   TestAccAWSIAMRole_MaxSessionDuration
--- PASS: TestAccAWSIAMRole_MaxSessionDuration (14.01s)
=== RUN   TestAccAWSIAMRole_PermissionsBoundary
--- PASS: TestAccAWSIAMRole_PermissionsBoundary (27.39s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	111.930s

Output from acceptance testing: AWS GovCloud (US)

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSIAMRole_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSIAMRole_ -timeout 120m
=== RUN   TestAccAWSIAMRole_importBasic
--- PASS: TestAccAWSIAMRole_importBasic (17.05s)
=== RUN   TestAccAWSIAMRole_basic
--- PASS: TestAccAWSIAMRole_basic (16.47s)
=== RUN   TestAccAWSIAMRole_basicWithDescription
--- PASS: TestAccAWSIAMRole_basicWithDescription (37.45s)
=== RUN   TestAccAWSIAMRole_namePrefix
--- PASS: TestAccAWSIAMRole_namePrefix (16.62s)
=== RUN   TestAccAWSIAMRole_testNameChange
--- PASS: TestAccAWSIAMRole_testNameChange (36.21s)
=== RUN   TestAccAWSIAMRole_badJSON
--- PASS: TestAccAWSIAMRole_badJSON (1.58s)
=== RUN   TestAccAWSIAMRole_force_detach_policies
--- PASS: TestAccAWSIAMRole_force_detach_policies (21.17s)
=== RUN   TestAccAWSIAMRole_MaxSessionDuration
--- PASS: TestAccAWSIAMRole_MaxSessionDuration (29.57s)
=== RUN   TestAccAWSIAMRole_PermissionsBoundary
--- PASS: TestAccAWSIAMRole_PermissionsBoundary (51.10s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	227.253s

[catsby]

LGTM 👍

[bflad]

This has been released in version 1.30.0 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!