provider/aws: Support kms_key_id for aws_rds_cluster

[stack72]

Fixes #7655

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSCluster_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSCluster_
-timeout 120m
=== RUN   TestAccAWSRDSCluster_basic
--- PASS: TestAccAWSRDSCluster_basic (127.57s)
=== RUN   TestAccAWSRDSCluster_kmsKey
--- PASS: TestAccAWSRDSCluster_kmsKey (323.72s)
=== RUN   TestAccAWSRDSCluster_encrypted
--- PASS: TestAccAWSRDSCluster_encrypted (173.25s)
=== RUN   TestAccAWSRDSCluster_backupsUpdate
--- PASS: TestAccAWSRDSCluster_backupsUpdate (264.07s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    888.638s

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSClusterInstance_kmsKey'              2 ↵ ✹
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSClusterInstance_kmsKey -timeout 120m
=== RUN   TestAccAWSRDSClusterInstance_kmsKey
--- PASS: TestAccAWSRDSClusterInstance_kmsKey (1152.36s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    1152.395s

[catsby]

This should probably just be computed, right? Because we can't set this here, correct?

[stack72]

@catsby in my test I am setting it :)

[catsby]

But you shouldn't be, right? It's not used in the resource, it's only read. As you noted in your comment actually using it would error.

[stack72]

Ah sorry, I posted another below that #7655 (comment)

[catsby]

👍 but Travis is read 😕

[stack72]

Sorry! FMT Errors - fixed now. Will merge on green :)

[ghost]

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