don't use public signing for F# tests (posible .NET SDK F# compiler bug with publicsign switch)

Author: dsyme

test/Microsoft.ML.FSharp.Tests/Microsoft.ML.FSharp.Tests.fsproj

@@ -2,7 +2,9 @@
 
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.0</TargetFrameworks>
+    <NoWarn>2003;$(NoWarn)</NoWarn>
     <TargetFrameworks Condition="'$(OS)' != 'Unix'">$(TargetFrameworks); net461</TargetFrameworks>
+    <PublicSign>false</PublicSign>
   </PropertyGroup>
 
   <ItemGroup>