fix(atracker) do not return region if it is not defined for resource (IBM-Cloud#6194)

* fix(atracker) do not return region if it is not defined for resource

* set region attribute to computed true

Author: wenjian2

ibm/service/atracker/resource_ibm_atracker_target.go

@@ -141,6 +141,7 @@ func ResourceIBMAtrackerTarget() *schema.Resource {
 			"region": &schema.Schema{
 				Type:         schema.TypeString,
 				Optional:     true,
+				Computed:     true,
 				ForceNew:     true,
 				ValidateFunc: validate.InvokeValidator("ibm_atracker_target", "region"),
 				Description:  "Include this optional field if you want to create a target in a different region other than the one you are connected.",

ibm/service/atracker/resource_ibm_atracker_target_test.go

@@ -93,7 +93,6 @@ func testAccCheckIBMAtrackerTargetConfigBasic(name string, targetType string) st
 		resource "ibm_atracker_target" "atracker_target_instance" {
 			name = "%s"
 			target_type = "%s"
-			region = "us-south"
 			cos_endpoint {
 					endpoint = "s3.private.us-east.cloud-object-storage.appdomain.cloud"
 					target_crn = "crn:v1:bluemix:public:cloud-object-storage:global:a/11111111111111111111111111111111:22222222-2222-2222-2222-222222222222::"
@@ -107,7 +106,6 @@ func testAccCheckIBMAtrackerTargetConfigBasic(name string, targetType string) st
 
 func testAccCheckIBMAtrackerTargetConfig(name string, targetType string, region string) string {
 	return fmt.Sprintf(`
-
 		resource "ibm_atracker_target" "atracker_target_instance" {
 			name = "%s"
 			target_type = "%s"