Merge remote-tracking branch 'upstream/master' into max_send_size_filter

examples/node/README.md

include/grpc++/impl/codegen/client_context.h

include/grpc/impl/codegen/port_platform.h

src/cpp/client/client_context.cc

src/csharp/Grpc.Core.Tests/project.json

src/csharp/Grpc.Core/GrpcEnvironment.cs

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

src/csharp/Grpc.Core/project.json

src/csharp/Grpc.Examples.MathClient/project.json

src/csharp/Grpc.Examples.MathServer/project.json

src/csharp/Grpc.Examples.Tests/project.json

src/csharp/Grpc.Examples/project.json

src/csharp/Grpc.HealthCheck.Tests/project.json

src/csharp/Grpc.IntegrationTesting.Client/project.json

src/csharp/Grpc.IntegrationTesting.QpsWorker/project.json

src/csharp/Grpc.IntegrationTesting.Server/project.json

src/csharp/Grpc.IntegrationTesting.StressClient/project.json

src/csharp/Grpc.IntegrationTesting/project.json

src/csharp/build_packages_dotnetcli.sh

src/node/README.md