Cannot checkout xdt submodule

[arsentuf-protag]

Trying to checkout submodules after a fresh clone I ran into this error:

> git submodule update --init --recursive
Submodule 'xdt' (https://git01.codeplex.com/xdt) registered for path 'xdt'
Cloning into 'C:/Users/arsen/Git/nuget-chocolatey/xdt'...
fatal: unable to update url base from redirection:
  asked for: https://git01.codeplex.com/xdt/info/refs?service=git-upload-pack
   redirect: https://archive.codeplex.com/?p=git01
fatal: clone of 'https://git01.codeplex.com/xdt' into submodule path 'C:/Users/arsen/Git/nuget-chocolatey/xdt' failed
Failed to clone 'xdt'. Retry scheduled
Cloning into 'C:/Users/arsen/Git/nuget-chocolatey/xdt'...
fatal: unable to update url base from redirection:
  asked for: https://git01.codeplex.com/xdt/info/refs?service=git-upload-pack
   redirect: https://archive.codeplex.com/?p=git01
fatal: clone of 'https://git01.codeplex.com/xdt' into submodule path 'C:/Users/arsen/Git/nuget-chocolatey/xdt' failed
Failed to clone 'xdt' a second time, aborting

Seems the repo that was hosting the xdt module has shut down

[AdmiringWorm]

@gep13 is this submodule even used for us?
If it is, we should probably update this submodule to use https://github.com/dotnet/xdt, or remove it if it isn't used.