giving a subnet to the mock command for validation in CI

.travis.yml

@@ -26,7 +26,7 @@ script:
 - echo 'script'
 - terraform init
 - terraform fmt -check=true
-- terraform validate -var "region=${AWS_REGION}" -var "vpc_id=vpc-123456" -var "subnets=[]" -var "workers_ami_id=ami-123456" -var "cluster_ingress_cidrs=[]" -var "cluster_name=test_cluster"
+- terraform validate -var "region=${AWS_REGION}" -var "vpc_id=vpc-123456" -var "subnets=['subnet-12345a']" -var "workers_ami_id=ami-123456" -var "cluster_ingress_cidrs=[]" -var "cluster_name=test_cluster"
 - docker run --rm -v $(pwd):/app/ --workdir=/app/ -t wata727/tflint --error-with-issues
 - cd examples/eks_test_fixture
 - terraform init

examples/eks_test_fixture/main.tf

@@ -12,6 +12,7 @@ provider "random" {
 }
 
 provider "http" {}
+provider "local" {}
 
 data "aws_ami" "eks_worker" {
   filter {
@@ -68,14 +69,6 @@ module "vpc" {
   tags               = "${merge(local.tags, map("kubernetes.io/cluster/${local.cluster_name}", "shared"))}"
 }
 
-module "security_group" {
-  source  = "terraform-aws-modules/security-group/aws"
-  version = "1.12.0"
-  name    = "test-sg-https"
-  vpc_id  = "${module.vpc.vpc_id}"
-  tags    = "${local.tags}"
-}
-
 module "eks" {
   source                = "../.."
   cluster_name          = "${local.cluster_name}"