Revert back to 3.1.0 runtime versions

[mmitche]

No description provided.

[mmitche]

These should start passing once new cli's and toolsets built on the older runtime propagate.

[mmitche]

@wli3 These look like real errors here and need reaction.

[wli3]

@swaroop-sridhar could you look in the this test failure? I don't know the goal of the test. Seems a simple rename could resolve it

Failure from this file https://github.com/dotnet/sdk/blob/aacf12466528c876667088ce960e00bae6cbb75b/src/Assets/TestProjects/HelloWorldWithSubDirs/Program.cs

##[error].dotnet/sdk/3.1.200-preview-014770/Sdks/NuGet.Build.Tasks.Pack/build/NuGet.Build.Tasks.Pack.targets(198,5): error NU5119: (NETCORE_ENGINEERING_TELEMETRY=Build) File '/datadisks/disk1/workspace/_work/9/s/artifacts/bin/Tests/Microsoft.NET.Publish.Tests/Debug/publish/Assets/TestProjects/HelloWorldWithSubDirs/SmallNameDir/This is a directory with a really long name for one that only contains a small file/.word' was not added to the package. Files and folders starting with '.' or ending with '.nupkg' are excluded by default. To include this file, use -NoDefaultExcludes from the commandline

[swaroop-sridhar]

Sure @wli3, I'll fix it.

[swaroop-sridhar]

Here it is @wli3: #4044

[wli3]

@swaroop-sridhar thanks!