2.2: Build fails with error NU5125

[natemcmaster]

I attempted to update our build to use a 2.2.100 RTM candidate of the SDK. This includes changes to NuGet which cause the build to fail with:

C:\b\w\d1c9b84e58362abc.dotnet\x64\sdk\2.2.100-rtm-009571\Sdks\NuGet.Build.Tasks.Pack\build\NuGet.Build.Tasks.Pack.targets(202,5): error NU5125: The 'licenseUrl' element will be deprecated. Consider using the 'license' element instead. [C:\b\w\d1c9b84e58362abc\src\Framework\Microsoft.AspNetCore.All\pkg\Microsoft.AspNetCore.All.pkgproj]

Presumably this was introduced in NuGet/NuGet.Client#2450.

@nkolev92 @rrelyea - are there known issues in this? The project in question, Microsoft.AspNetCore.All.pkgproj, is not using a hand-written nuspec.

cc @Eilon blocking issue for 2.2 RTM.

[nkolev92]

That's a warning that's getting elevated to an error.

It's a new feature we are working on.
NuGet/Home#4628

It will ship in 2.2.1xx and 2.1.5xx, as well as NuGet.exe 4.9 and VS 2017.9.

[natemcmaster]

Fixed in #3758