Base auto updates on ProdCon

[StephenBonikowsky]

@dagood added functionality to buildtools to allow us to get auto updated based on ProdCon builds using the orchestration feeds.

dotnet/buildtools#2047

I believe we would have to update our subscription as the release moves milestones which is reflected by dirs in the versions repo.

[dagood]

I believe we would have to update our subscription as the release moves milestones which is reflected by dirs in the versions repo.

Correct, unfortunately there's not currently a place that tracks which is the best to use among 2.1, 2.1-preview2, 2.1-rc1, 2.1-rtm, etc.

[Lxiamail]

Done