Fixed NonCPS method location and Ubuntu 16.04 image

Change-Id: Ib3c623d82316544e42b61d4637f0dbe24df5fc5b
diff --git a/ubuntu-16.04/template.json b/ubuntu-16.04/template.json
index 6b84cc0..e88d7ee 100644
--- a/ubuntu-16.04/template.json
+++ b/ubuntu-16.04/template.json
@@ -232,9 +232,9 @@
       "vm_name": "{{ user `distro` }}-{{ isotime \"200601021504\"  }}",
       "output_directory": "images/{{ user `distro` }}-qemu-{{ isotime \"200601021504\"  }}",
       "format": "qcow2",
-      "iso_checksum": "1ba74ef0acade70d8c394308fab8913c",
+      "iso_checksum": "b0ae9a56442c409bb3ab11815c910499",
       "iso_checksum_type": "md5",
-      "iso_url": "https://cloud-images.ubuntu.com/xenial/20180213.2/xenial-server-cloudimg-amd64-disk1.img",
+      "iso_url": "https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img",
       "disk_image": true,
       "accelerator": "kvm",
       "disk_size": "{{ user `disk_size`}}",