added default value in variables

Author: rosspatil

examples/simple_zonal_private/terraform.tfplan

@@ -16,6 +16,7 @@
 
 variable "project_id" {
   description = "The project ID to host the cluster in"
+  default = "vanguard-20200519"
 }
 
 variable "cluster_name_suffix" {
@@ -25,27 +26,33 @@ variable "cluster_name_suffix" {
 
 variable "region" {
   description = "The region to host the cluster in"
+  default = "asia-south1"
 }
 
 variable "zones" {
   type        = list(string)
   description = "The zone to host the cluster in (required if is a zonal cluster)"
+  default = ["asia-south1-c"]
 }
 
 variable "network" {
   description = "The VPC network to host the cluster in"
+ default = "default"
 }
 
 variable "subnetwork" {
   description = "The subnetwork to host the cluster in"
+default = "default"
 }
 
 variable "ip_range_pods" {
   description = "The secondary ip range to use for pods"
+default="asia-south1-c-ip-pods"
 }
 
 variable "ip_range_services" {
   description = "The secondary ip range to use for services"
+default="asia-south1-c-ip-services"
 }
 
 variable "compute_engine_service_account" {