Merge github.com:grpc/grpc into y12kdm3

src/core/channel/client_channel.c

src/core/surface/call.c

src/core/surface/server.c

src/csharp/Grpc.Auth/AuthInterceptors.cs

src/csharp/Grpc.Auth/Grpc.Auth.csproj

src/csharp/Grpc.Core/AsyncClientStreamingCall.cs

src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs

src/csharp/Grpc.Core/AsyncServerStreamingCall.cs

src/csharp/Grpc.Core/ChannelOptions.cs

src/csharp/Grpc.Core/ClientBase.cs

src/csharp/Grpc.Core/Method.cs

src/csharp/Grpc.IntegrationTesting/InteropClient.cs

src/csharp/ext/grpc_csharp_ext.c

src/node/ext/call.cc

src/node/ext/call.h

src/node/ext/node_grpc.cc

src/node/ext/server.cc

src/node/index.js

src/node/src/client.js

src/node/src/server.js