Closes https://github.com/StefanScherer/packer-windows/issues/62

The vmware-iso build still needs to have a guest_ost_type: windows9srv-64

windows_2016.json

@@ -45,7 +45,7 @@
         "./scripts/sysprep.bat",
         "./scripts/win-updates.ps1"
       ],
-      "guest_os_type": "Windows2016_64",
+      "guest_os_type": "windows9srv-64",
       "headless": "{{user `headless`}}",
       "iso_checksum": "{{user `iso_checksum`}}",
       "iso_checksum_type": "{{user `iso_checksum_type`}}",