Replace obsolete feeds

Author: Tratcher

build/sources.props

@@ -15,13 +15,12 @@
     </RestoreSources>
     <RestoreSources Condition=" '$(DotNetBuildOffline)' != 'true' AND '$(DisableMyGetRestoreSources)' != 'true' ">
       $(RestoreSources);
-      https://dotnet.myget.org/F/dotnet-core/api/v3/index.json;
       https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json;
       https://dotnet.myget.org/F/aspnetcore-tools/api/v3/index.json;
       https://dotnet.myget.org/F/aspnetcore-master/api/v3/index.json;
       https://dotnet.myget.org/F/roslyn/api/v3/index.json;
-      https://vside.myget.org/F/vssdk/api/v3/index.json;
-      https://vside.myget.org/F/vsmac/api/v3/index.json;
+      https://pkgs.dev.azure.com/azure-public/vside/_packaging/vssdk/nuget/v3/index.json;
+      https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-impl/nuget/v3/index.json;
     </RestoreSources>
 
     <PublicCoreFeedPrefix>https://dotnetcli.blob.core.windows.net/dotnet/</PublicCoreFeedPrefix>