Merge commit '4e57e8be' into p0-advance-protobuf-version

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

src/csharp/Grpc.Core/VersionInfo.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/NUnitMain.cs

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

src/csharp/Grpc.Examples/project.json

src/csharp/Grpc.HealthCheck.Tests/NUnitMain.cs

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

src/csharp/Grpc.HealthCheck/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/GeneratedClientTest.cs

src/csharp/Grpc.IntegrationTesting/InteropClient.cs

src/csharp/Grpc.IntegrationTesting/NUnitMain.cs

src/csharp/Grpc.IntegrationTesting/project.json

src/csharp/build_packages.bat