fix C# sanity and other nits

src/csharp/Grpc.Core.Api/Utils/EncodingExtensions.cs

@@ -1,5 +1,5 @@
 #region Copyright notice and license
-// Copyright 2015 gRPC authors.
+// Copyright 2019 The gRPC Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

src/csharp/Grpc.Core.Tests/Internal/WellKnownStringsTest.cs

@@ -1,5 +1,5 @@
 #region Copyright notice and license
-// Copyright 2015 gRPC authors.
+// Copyright 2019 The gRPC Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@ using System.Text;
 using Grpc.Core.Internal;
 using NUnit.Framework;
 
-namespace Grpc.Core.Tests.Internal
+namespace Grpc.Core.Internal.Tests
 {
     public class WellKnownStringsTest
     {

src/csharp/Grpc.Core/Internal/WellKnownStrings.cs

@@ -1,5 +1,5 @@
 #region Copyright notice and license
-// Copyright 2015 gRPC authors.
+// Copyright 2019 The gRPC Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

src/csharp/tests.json

@@ -14,6 +14,7 @@
     "Grpc.Core.Internal.Tests.ReusableSliceBufferTest",
     "Grpc.Core.Internal.Tests.SliceTest",
     "Grpc.Core.Internal.Tests.TimespecTest",
+    "Grpc.Core.Internal.Tests.WellKnownStringsTest",
     "Grpc.Core.Tests.AppDomainUnloadTest",
     "Grpc.Core.Tests.AuthContextTest",
     "Grpc.Core.Tests.AuthPropertyTest",