Merge branch 'master' of github.com:grpc/grpc into matrix

include/grpc++/grpc++.h

include/grpc++/server_builder.h

src/cpp/server/server_builder.cc

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

src/csharp/Grpc.Core.Testing/Grpc.Core.Testing.csproj

src/csharp/Grpc.Core/Common.csproj.include

src/csharp/Grpc.Core/Grpc.Core.csproj

src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj

src/csharp/Grpc.IntegrationTesting/ClientRunners.cs

src/csharp/Grpc.IntegrationTesting/QpsWorker.cs

src/csharp/Grpc.IntegrationTesting/ServerRunners.cs

src/csharp/Grpc.Reflection/Grpc.Reflection.csproj

src/node/performance/benchmark_client.js

...n/grpcio_reflection/grpc_reflection/v1alpha/reflection.py

test/cpp/microbenchmarks/bm_fullstack_trickle.cc

tools/distrib/pylint_code.sh

...ckerfile/interoptest/grpc_interop_java_oracle8/Dockerfile

...le/interoptest/grpc_interop_java_oracle8/build_interop.sh

tools/dockerfile/test/cxx_alpine_x64/Dockerfile

tools/dockerfile/test/python_alpine_x64/Dockerfile