Fix health check autocreation and id output in passthrough LB modules (#1928)

* fix health check autocreation and id output

* fix health check exclusion

modules/net-lb-ext/README.md

@@ -290,7 +290,7 @@ module "nlb" {
 | [group_self_links](outputs.tf#L53) | Optional unmanaged instance group self links. |  |
 | [groups](outputs.tf#L60) | Optional unmanaged instance group resources. |  |
 | [health_check](outputs.tf#L65) | Auto-created health-check resource. |  |
-| [health_check_self_id](outputs.tf#L70) | Auto-created health-check self id. |  |
+| [health_check_id](outputs.tf#L70) | Auto-created health-check id. |  |
 | [health_check_self_link](outputs.tf#L75) | Auto-created health-check self link. |  |
 | [id](outputs.tf#L80) | Fully qualified forwarding rule ids. |  |
 <!-- END TFDOC -->

modules/net-lb-ext/health-check.tf

@@ -17,7 +17,9 @@
 # tfdoc:file:description Health check resource.
 
 locals {
-  hc       = var.health_check_config
+  hc = (
+    var.health_check != null ? null : var.health_check_config
+  )
   hc_grpc  = try(local.hc.grpc, null) != null
   hc_http  = try(local.hc.http, null) != null
   hc_http2 = try(local.hc.http2, null) != null

modules/net-lb-ext/outputs.tf

@@ -67,8 +67,8 @@ output "health_check" {
   value       = try(google_compute_region_health_check.default.0, null)
 }
 
-output "health_check_self_id" {
-  description = "Auto-created health-check self id."
+output "health_check_id" {
+  description = "Auto-created health-check id."
   value       = try(google_compute_region_health_check.default.0.id, null)
 }