resource/aws_ec2_traffic_mirror_target: Add tags argument and networ…

…k_load_balancer_arn plan-time validation (#12135)

Output from acceptance testing:

```
--- PASS: TestAccAWSEc2TrafficMirrorTarget_eni (74.21s)
--- PASS: TestAccAWSEc2TrafficMirrorTarget_tags (377.38s)
--- PASS: TestAccAWSEc2TrafficMirrorTarget_disappears (591.15s)
--- PASS: TestAccAWSEc2TrafficMirrorTarget_nlb (750.29s)
```

aws/resource_aws_ec2_traffic_mirror_target.go

@@ -7,12 +7,14 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
+	"github.com/terraform-providers/terraform-provider-aws/aws/internal/keyvaluetags"
 )
 
 func resourceAwsEc2TrafficMirrorTarget() *schema.Resource {
 	return &schema.Resource{
 		Create: resourceAwsEc2TrafficMirrorTargetCreate,
 		Read:   resourceAwsEc2TrafficMirrorTargetRead,
+		Update: resourceAwsEc2TrafficMirrorTargetUpdate,
 		Delete: resourceAwsEc2TrafficMirrorTargetDelete,
 		Importer: &schema.ResourceImporter{
 			State: schema.ImportStatePassthrough,
@@ -40,7 +42,9 @@ func resourceAwsEc2TrafficMirrorTarget() *schema.Resource {
 					"network_interface_id",
 					"network_load_balancer_arn",
 				},
+				ValidateFunc: validateArn,
 			},
+			"tags": tagsSchema(),
 		},
 	}
 }
@@ -61,6 +65,10 @@ func resourceAwsEc2TrafficMirrorTargetCreate(d *schema.ResourceData, meta interf
 		input.NetworkLoadBalancerArn = aws.String(v.(string))
 	}
 
+	if v, ok := d.GetOk("tags"); ok {
+		input.TagSpecifications = ec2TagSpecificationsFromMap(v.(map[string]interface{}), ec2.ResourceTypeTrafficMirrorTarget)
+	}
+
 	out, err := conn.CreateTrafficMirrorTarget(input)
 	if err != nil {
 		return fmt.Errorf("Error creating traffic mirror target %v", err)
@@ -71,6 +79,20 @@ func resourceAwsEc2TrafficMirrorTargetCreate(d *schema.ResourceData, meta interf
 	return resourceAwsEc2TrafficMirrorTargetRead(d, meta)
 }
 
+func resourceAwsEc2TrafficMirrorTargetUpdate(d *schema.ResourceData, meta interface{}) error {
+	conn := meta.(*AWSClient).ec2conn
+
+	if d.HasChange("tags") {
+		o, n := d.GetChange("tags")
+
+		if err := keyvaluetags.Ec2UpdateTags(conn, d.Id(), o, n); err != nil {
+			return fmt.Errorf("error updating EC2 Traffic Mirror Target (%s) tags: %s", d.Id(), err)
+		}
+	}
+
+	return resourceAwsEc2TrafficMirrorTargetRead(d, meta)
+}
+
 func resourceAwsEc2TrafficMirrorTargetRead(d *schema.ResourceData, meta interface{}) error {
 	conn := meta.(*AWSClient).ec2conn
 
@@ -101,6 +123,10 @@ func resourceAwsEc2TrafficMirrorTargetRead(d *schema.ResourceData, meta interfac
 	d.Set("network_interface_id", target.NetworkInterfaceId)
 	d.Set("network_load_balancer_arn", target.NetworkLoadBalancerArn)
 
+	if err := d.Set("tags", keyvaluetags.Ec2KeyValueTags(target.Tags).IgnoreAws().Map()); err != nil {
+		return fmt.Errorf("error setting tags: %s", err)
+	}
+
 	return nil
 }