upgrade VPC Ids and DB Subnet to be optionally computed

builtin/providers/aws/resource_aws_db_instance.go

@@ -140,6 +140,7 @@ func resourceAwsDbInstance() *schema.Resource {
 			"vpc_security_group_ids": &schema.Schema{
 				Type:     schema.TypeSet,
 				Optional: true,
+				Computed: true,
 				Elem:     &schema.Schema{Type: schema.TypeString},
 				Set: func(v interface{}) int {
 					return hashcode.String(v.(string))
@@ -164,6 +165,7 @@ func resourceAwsDbInstance() *schema.Resource {
 				Type:     schema.TypeString,
 				Optional: true,
 				ForceNew: true,
+				Computed: true,
 			},
 
 			"parameter_group_name": &schema.Schema{