Fix outputs to be a string values (#10)

Author: const-bon

outputs.tf

@@ -3,19 +3,19 @@ output "public_ip" {
 }
 
 output "private_ip" {
-  value = "${aws_instance.default.*.private_ip}"
+  value = "${join("", aws_instance.default.*.private_ip)}"
 }
 
 output "private_dns" {
-  value = "${aws_instance.default.*.private_dns}"
+  value = "${join("", aws_instance.default.*.private_dns)}"
 }
 
 output "public_dns" {
   value = "${coalesce(join("", null_resource.eip.*.triggers.public_dns), aws_instance.default.public_dns)}"
 }
 
 output "id" {
-  value = "${aws_instance.default.*.id}"
+  value = "${join("", aws_instance.default.*.id)}"
 }
 
 output "ssh_key_pair" {
@@ -27,9 +27,9 @@ output "security_group_ids" {
 }
 
 output "role" {
-  value = "${aws_iam_role.default.*.name}"
+  value = "${join("", aws_iam_role.default.*.name)}"
 }
 
 output "alarm" {
-  value = "${aws_cloudwatch_metric_alarm.default.*.id}"
+  value = "${join("", aws_cloudwatch_metric_alarm.default.*.id)}"
 }