Windows Server 2016 blocks on bootup during vmware build. Guest OS Type incorrect?

[arizvisa]

When building the eval-win2016-standard.json template, it seems to block during bootup. I recall having this issue before in another template but with the "guest_os_type" being wrong. At the moment the "guest_os_type" field for all of the server 2016 vmware builders are using a "guest_os_type" of "windows8srv-64". According to the open-vm-tools this field should be "windows9srv-64"

This corresponds to the symptom, but since I haven't proved it yet. I'm going to hold on before changing it. This issue will track that progress of proving the guest_os_type is causing the issue after I finish some preliminary work on issue #248.