Remove Nuget.config changes

Author: Andrew Hall

NuGet.config

@@ -24,8 +24,6 @@
     <add key="richnav" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-buildservices/nuget/v3/index.json" />
     <!-- Used for BenchmarkDotNet prerelease packages -->
     <add key="benchmark-dotnet-prerelease" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/benchmark-dotnet-prerelease/nuget/v3/index.json" />
-    <add key="local_shipping" value="S:\roslyn\artifacts\packages\Debug\Shipping" />
-    <add key="local_nonshipping" value="S:\roslyn\artifacts\packages\Debug\NonShipping" />
   </packageSources>
   <!--
     ****************************** AUTOGENERATED ***********************************
@@ -54,12 +52,6 @@
       <package pattern="microsoft.*" />
       <package pattern="sn" />
     </packageSource>
-    <packageSource key="local_shipping">
-      <package pattern="microsoft.*" />
-    </packageSource>
-    <packageSource key="local_nonshipping">
-      <package pattern="microsoft.*" />
-    </packageSource>
     <packageSource key="dotnet-tools">
       <package pattern="microsoft.*" />
       <package pattern="nuget.common" />