HA VPN over Interconnect modules and blueprint (#1390)

Two new modules, net-ipsec-over-interconnect to establish HA VPN over existing VLAN attachments, and net-dedicated-vlan-attachment to create (optionally encrypted) vlan attachments, as well as the ha-vpn-over-interconnect blueprint that shows how to compose such modules to create a 99.9% encrypted interconnect.

modules/net-ipsec-over-interconnect/outputs.tf

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+/**
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+output "bgp_peers" {
+  description = "BGP peer resources."
+  value = {
+    for k, v in google_compute_router_peer.default : k => v
+  }
+}
+
+output "external_gateway" {
+  description = "External VPN gateway resource."
+  value       = local.peer_gateway
+}
+
+output "gateway_id" {
+  description = "VPN gateway ID."
+  value       = google_compute_ha_vpn_gateway.default.id
+}
+
+output "gateway_self_link" {
+  description = "VPN gateway self_link."
+  value       = google_compute_ha_vpn_gateway.default.self_link
+}
+
+output "random_secret" {
+  description = "Generated secret."
+  value       = local.secret
+}
+
+output "router" {
+  description = "Router resource (only if auto-created)."
+  value       = one(google_compute_router.default[*])
+}
+
+output "router_name" {
+  description = "Router name."
+  value       = local.router
+}
+
+output "self_link" {
+  description = "HA VPN gateway self link."
+  value       = google_compute_ha_vpn_gateway.default.self_link
+}
+
+output "tunnels" {
+  description = "VPN tunnel resources."
+  value = {
+    for name in keys(var.tunnels) :
+    name => {
+      self_link = google_compute_vpn_tunnel.default[name].self_link
+      name      = google_compute_vpn_tunnel.default[name].name
+      peer_ip   = google_compute_vpn_tunnel.default[name].peer_ip
+    }
+  }
+}