React to update CoreCLR packages

aspnet/Coherence#97

Author: JunTaoLuo

test/Microsoft.AspNetCore.Server.Kestrel.FunctionalTests/project.json

@@ -17,7 +17,7 @@
           "version": "1.0.0-*",
           "type": "platform"
         },
-        "System.Net.Http": "4.0.1-*",
+        "System.Net.Http": "4.1.0-*",
         "System.Net.Http.WinHttpHandler": "4.0.0-*",
         "System.Runtime.Serialization.Primitives": "4.1.1-*"
       },

test/Microsoft.AspNetCore.Server.KestrelTests/project.json

@@ -18,7 +18,7 @@
         "System.Diagnostics.TraceSource": "4.0.0-*",
         "System.Globalization.Extensions": "4.0.1-*",
         "System.IO": "4.1.0-*",
-        "System.Net.Http": "4.0.1-*",
+        "System.Net.Http": "4.1.0-*",
         "System.Net.Http.WinHttpHandler": "4.0.0-*",
         "System.Net.Sockets": "4.1.0-*",
         "System.Runtime.Handles": "4.0.1-*"