provider/aws: Add support to aws_redshift_cluster for iam_roles

[stack72]

As requested in #6594

TF_LOG=1 make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRedshiftCluster' 2>~/tf.log
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRedshiftCluster -timeout 120m
=== RUN   TestAccAWSRedshiftCluster_basic
--- PASS: TestAccAWSRedshiftCluster_basic (558.29s)
=== RUN   TestAccAWSRedshiftCluster_iamRoles
--- PASS: TestAccAWSRedshiftCluster_iamRoles (783.75s)
=== RUN   TestAccAWSRedshiftCluster_publiclyAccessible
--- PASS: TestAccAWSRedshiftCluster_publiclyAccessible (721.13s)
=== RUN   TestAccAWSRedshiftCluster_updateNodeCount
--- PASS: TestAccAWSRedshiftCluster_updateNodeCount (1945.31s)
=== RUN   TestAccAWSRedshiftCluster_tags
--- PASS: TestAccAWSRedshiftCluster_tags (649.34s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    4657.849s

[phinze]

Looks solid - LGTM!

[ghost]

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