[#1764] net-lb-int: add support for dual stack and multiple forwarding rules

tests/modules/net_lb_int/defaults.yaml

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 values:
-  google_compute_forwarding_rule.default:
+  google_compute_forwarding_rule.forwarding_rules[""]:
     all_ports: true
     ip_protocol: TCP
     labels: null

tests/modules/net_lb_int/forwarding-rule.tfvars

@@ -11,4 +11,10 @@ backends = [{
   failover       = false
 }]
 global_access = true
-ports         = [80]
+
+forwarding_rules_config = {
+  "port-80" = {
+    ports = [80]
+  }
+}
+

tests/modules/net_lb_int/forwarding-rule.yaml

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 values:
-  google_compute_forwarding_rule.default:
+  google_compute_forwarding_rule.forwarding_rules["port-80"]:
     all_ports: null
     allow_global_access: true
     ports: