* Remove dotnet-corefxlab feed

* Fix SocialWeather so that it restores as part of test runs.

NuGet.config

@@ -2,7 +2,6 @@
 <configuration>
   <packageSources>
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
-    <add key="dotnet-corefxlab" value="https://dotnet.myget.org/F/dotnet-corefxlab/api/v3/index.json" />
     <add key="AspNetCore" value="https://dotnet.myget.org/F/aspnetcore-ci-dev/api/v3/index.json" />
   </packageSources>
 </configuration>

samples/SocialWeather/project.json

@@ -9,9 +9,7 @@
     "Microsoft.AspNetCore.Server.Kestrel": "1.1.0-*",
     "Microsoft.Extensions.Logging.Console": "1.1.0-*",
     "Newtonsoft.Json": "9.0.1",
-    "Microsoft.AspNetCore.Sockets": {
-      "target": "project"
-    },
+    "Microsoft.AspNetCore.Sockets": "0.1.0-*",
     "Microsoft.AspNetCore.StaticFiles": "1.1.0-*",
     "Google.Protobuf": "3.1.0"
   },