dns: ignore case changes for DS records (#4769) (#3236)

DS records need case change suppression as with "MX" records.

Closes hashicorp/terraform-provider-google#9093

Signed-off-by: Modular Magician <magic-modules@google.com>

.changelog/4769.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+dns: suppress spurious diffs due to case changes in DS records
+```

google-beta/resource_dataflow_flex_template_job_test.go

@@ -8,7 +8,7 @@ import (
 
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
-	compute "google.golang.org/api/compute/v1"
+	"google.golang.org/api/compute/v1"
 )
 
 func TestAccDataflowFlexTemplateJob_basic(t *testing.T) {

google-beta/resource_dataproc_cluster_test.go

@@ -13,8 +13,9 @@ import (
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
 
-	dataproc "google.golang.org/api/dataproc/v1beta2"
 	"google.golang.org/api/googleapi"
+
+	dataproc "google.golang.org/api/dataproc/v1beta2"
 )
 
 func TestDataprocExtractInitTimeout(t *testing.T) {

google-beta/resource_dns_resource_dns_record_set.go

@@ -41,7 +41,7 @@ func rrdatasDnsDiffSuppress(k, old, new string, d *schema.ResourceData) bool {
 		case "AAAA":
 			// parse ipv6 to a key from one list
 			return net.ParseIP(record).String()
-		case "MX":
+		case "MX", "DS":
 			return strings.ToLower(record)
 		case "TXT":
 			return strings.ToLower(strings.Trim(record, `"`))