[DNM] Add windowsservercore with MSI installers

[nschonni]

This doesn't replace the other Windows PRs like #720, just showing an alternate using the MSI installers.

EX:

1. docker build .\8\windowsservercore\ -t nodejs:windowsservercore-8
2. docker run --rm -it nodejs:windowsservercore-8 powershell

Windows PowerShell Copyright (C) Microsoft Corporation. All rights reserved. PS C:\> yarn --version 1.6.0 PS C:\> node --verson C:\Program Files\nodejs\node.exe: bad option: --verson PS C:\> node --version v8.11.3 PS C:\> npm --version 5.6.0 PS C:\> whoami user manager\containeradministrator 

Pros:

• The GPG part isn't needed
• The MSIs setup perf counters and the Path automagially

Cons:

• This method won't work for nanoserver. I've opened up APPX packaged version for Windows Server 2016 build#1413 to see if an APPX package can be built to support that.

/cc @LaurentGoderre@StefanScherer