data-source/aws_kms_secret: Soft remove data source type with removal message

[bflad]

References:

• aws_kms_secret is using private SDK feature that will no longer work after Core 0.12 #5144
• New Data Source: aws_kms_secrets and add DeprecationMessage to aws_kms_secret data source #5195

The aws_kms_secret data source uses dynamic attribute functionality which is not supported in Terraform 0.12 and later. Available since Terraform AWS Provider version 1.29.0, operators should migrate to the aws_kms_secrets data source, which uses a plaintext map attribute. Additional information can be found in the Version 2 Upgrade Guide: https://www.terraform.io/docs/providers/aws/guides/version-2-upgrade.html#data-source-aws_kms_secret

Output from Terraform 0.11 attempted usage:

terraform apply
data.aws_kms_secret.testing: Refreshing state...

Error: Error refreshing state: 1 error(s) occurred:

* data.aws_kms_secret.testing: 1 error(s) occurred:

* data.aws_kms_secret.testing: data.aws_kms_secret.testing: This data source has been replaced with the `aws_kms_secrets` data source. Upgrade information is available at: https://www.terraform.io/docs/providers/aws/guides/version-2-upgrade.html#data-source-aws_kms_secret

Output from Terraform 0.12 attempted usage (we cannot return the proper error message if there are references, however capturing the output here in case some one is searching for this in the future):

$ terraform apply

Error: Unsupported block type

  on main.tf line 10, in data "aws_kms_secret" "testing":
  10:     context {

Blocks of type "context" are not expected here. Did you mean to define
argument "context"? If so, use the equals sign to assign it a value.

$ terraform 0.12upgrade -yes
$ terraform apply

Error: Unsupported attribute

  on main.tf line 17, in output "testing":
  17:   value = data.aws_kms_secret.testing.secret_name

This object has no argument, nested block, or exported attribute named
"secret_name".

Output from Terraform 0.11 acceptance testing:

--- PASS: TestAccAWSKmsSecretDataSource_removed (2.05s)

Output from Terraform 0.12 acceptance testing:

--- PASS: TestAccAWSKmsSecretDataSource_removed (2.18s)

[ghost]

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