Add newer feed back **only for the tests projects**, Sqlite for example has...

Add newer feed back **only for the tests projects**, Sqlite for example has bugs in rc1-final fixed in rc2-15948

NuGet.Config

@@ -6,6 +6,6 @@
     <add key="CoreCLR" value="https://www.myget.org/F/dotnet-coreclr/api/v3/index.json" />
     -->
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
-    <!--<add key="aspnetvnext" value="https://www.myget.org/F/aspnetvnext/"/>-->
+    <add key="aspnetvnext" value="https://www.myget.org/F/aspnetvnext/"/>
   </packageSources>
 </configuration>