tgc-revival: add networksecurity resources (#15133)

Author: zli82016

mmv1/products/networksecurity/GatewaySecurityPolicyRule.yaml

@@ -31,6 +31,7 @@ timeouts:
   insert_minutes: 30
   update_minutes: 30
   delete_minutes: 30
+include_in_tgc_next_DO_NOT_USE: true
 autogen_async: true
 async:
   actions: ['create', 'delete', 'update']
@@ -55,6 +56,8 @@ examples:
     vars:
       gateway_security_policy_id: 'my-gateway-security-policy'
       resource_name: 'my-gateway-security-policy-rule'
+    tgc_test_ignore_extra:
+      - 'tls_inspection_enabled' # Ignore its false value in Terraform configuration
 parameters:
   - name: 'name'
     type: String

mmv1/products/networksecurity/UrlLists.yaml

@@ -45,6 +45,7 @@ async:
   result:
     resource_inside_response: false
 custom_code:
+include_in_tgc_next_DO_NOT_USE: true
 examples:
   - name: 'network_security_url_lists_basic'
     primary_resource_id: 'default'

mmv1/templates/terraform/flatten_property_method.go.tmpl

@@ -130,6 +130,12 @@ func flatten{{$.GetPrefix}}{{$.TitlelizeProperty}}(v interface{}, d *schema.Reso
 		return intVal
 	}
 
+ {{- if and $.ResourceMetadata.IsTgcCompiler $.Required }}
+	if v == nil {
+		return 0
+	}
+ {{- end }}
+
 	return v // let terraform core handle it otherwise
   {{- else if and ($.IsA "Array") ($.ItemType.IsA "ResourceRef")}}
   if v == nil {