Revert "Fix isotime"

This reverts commit 870c705ae11e78e54a21a731a5b8116d0fabac22.
diff --git a/ubuntu-16.04/template.json b/ubuntu-16.04/template.json
index 18390aa..b476972 100644
--- a/ubuntu-16.04/template.json
+++ b/ubuntu-16.04/template.json
@@ -76,7 +76,7 @@
     {
       "type": "vagrant",
       "keep_input_artifact": true,
-      "output": "images/{{ user `distro` }}-{{.Provider}}-{{ isotime '20060102030405' }}.box",
+      "output": "images/{{ user `distro` }}-{{.Provider}}-{{ isotime "20060102030405" }}.box",
       "except": [ "digitalocean", "docker" ]
     },
     {
@@ -87,7 +87,7 @@
     },
     {
       "type": "docker-save",
-      "path": "images/{{ user `distro` }}-docker-{{ isotime '20060102030405' }}.tar",
+      "path": "images/{{ user `distro` }}-docker-{{ isotime "20060102030405" }}.tar",
       "only": ["docker"]
     }
   ],
@@ -122,7 +122,7 @@
       ],
       "boot_wait": "5s",
       "disk_size": "{{ user `disk_size`}}",
-      "output_directory": "images/{{ user `distro` }}-vbox-{{ isotime '20060102030405'  }}",
+      "output_directory": "images/{{ user `distro` }}-vbox-{{ isotime "20060102030405"  }}",
       "guest_os_type": "Ubuntu_64",
       "http_directory": "http",
       "iso_checksum": "23e97cd5d4145d4105fbf29878534049",
@@ -174,7 +174,7 @@
       "disk_size": "{{ user `disk_size`}}",
       "disk_type_id": 4,
       "vmdk_name": "{{ user `distro`}}",
-      "output_directory": "images/{{ user `distro` }}-vmware-{{ isotime '20060102030405'  }}",
+      "output_directory": "images/{{ user `distro` }}-vmware-{{ isotime "20060102030405"  }}",
       "guest_os_type": "linux",
       "http_directory": "http",
       "iso_checksum": "23e97cd5d4145d4105fbf29878534049",
@@ -196,8 +196,8 @@
       "qemuargs": [
         [ "-m", "1024M" ]
       ],
-      "vm_name": "{{ user `distro` }}-{{ isotime '20060102030405'  }}",
-      "output_directory": "images/{{ user `distro` }}-qemu-{{ isotime '20060102030405'  }}",
+      "vm_name": "{{ user `distro` }}-{{ isotime "20060102030405"  }}",
+      "output_directory": "images/{{ user `distro` }}-qemu-{{ isotime "20060102030405"  }}",
       "format": "qcow2",
       "accelerator": "kvm",
       "disk_size": "{{ user `disk_size`}}",
@@ -255,7 +255,7 @@
       "type": "digitalocean",
       "api_token": "{{user `do_api_token`}}",
       "image": "{{user `distro`}}",
-      "snapshot_name": "{{ user `distro` }}-{{ isotime '20060102030405'  }}",
+      "snapshot_name": "{{ user `distro` }}-{{ isotime "20060102030405"  }}",
       "region" : "ams2",
       "size" : "1gb"
     }