Updated get-vim-ips script to use hostnames.

- Made the qemu-agent content in the cloud-init config to be controlled
  by a 'install-qemu-agent' flag.

modules/aws-nodes/outputs.tf

@@ -1,3 +1,7 @@
 output "ips" {
   value = aws_instance.nodes.*.public_ip
 }
+
+output "names" {
+  value = aws_instance.nodes.*.tags.Name
+}