azurerm_hdinsight_kafka_cluster: Add support for encryption_in_transit_enabled argument

[favoretti]

$ TF_ACC=1 go test -v ./azurerm/internal/services/hdinsight -timeout=1000m -run 'TestAccHDInsightKafkaCluster_encryptionInTransitEnabled'
2021/05/16 10:44:36 [DEBUG] not using binary driver name, it's no longer needed
2021/05/16 10:44:36 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccHDInsightKafkaCluster_encryptionInTransitEnabled
=== PAUSE TestAccHDInsightKafkaCluster_encryptionInTransitEnabled
=== CONT  TestAccHDInsightKafkaCluster_encryptionInTransitEnabled
--- PASS: TestAccHDInsightKafkaCluster_encryptionInTransitEnabled (1073.48s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/hdinsight	1074.850s

Fixes #11732

[katbyte]

Thanks @favoretti - LGTM 👍

[ghost]

This has been released in version 2.60.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.60.0"
}
# ... other configuration ...

[github-actions]

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