Revert "Updating to the newest Roslyn packages"
Revert "Updating to the newest Roslyn packages"

This reverts commit 50af106b6adebd9aba3b65df31f2d5b88a666a81.

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore