Bump Grpc from 1.19.0 to 2.29.0 in /GrpcHost

[dependabot-preview]

Bumps Grpc from 1.19.0 to 2.29.0.

Release notes

Sourced from Grpc's releases.

Release v1.28.1

This is the 1.28.1 release (galactic) of gRPC Core.

Please see the notes for the previous releases here: https://github.com/grpc/grpc/releases. Please consult https://grpc.io/ for all information regarding this product.

This release is a patch specifically for the Python bindings to address grpc/grpc#22546.

Python

• Backport #22549 to 1.28 (Only load simple stubs code on 3.6+ interpreters). (#22550)

Release v1.28.0

This is the 1.28.0 release (galactic) of gRPC Core.

Please see the notes for the previous releases here: https://github.com/grpc/grpc/releases. Please consult https://grpc.io/ for all information regarding this product.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• feat: add x-goog-user-project header from quota_project_id field. (#21324)
• Reintroduce #21527 (boringssl submodule unification - take two). (#21833)
• Reintroduce #21527 (boringssl submodule unification). (#21797)
• Treat an empty http_proxy mean "Don't use proxy" and skip parsing it. (#21632)

C++

• This release adds an experimental client side implementation of xDSv2 APIs. This allows a gRPC client written in C++ to receive configuration from an xDSv2 API compatible server and use that configuration to load balance RPCs. In this release, only the virtual host matching and cluster route action is supported. More features will be added in future.
• Cherrypick #22147: xds: send no-overprovisioning client capability and populate user_agent fields. (#22177)
• Fix regression in MSVC runtime flag. (#21792)
• Unify boringssl submodules and use non-developer boringssl cmake build. (#21527)

Objective-C

• Fix ObjC memory consumption increase as app runs. (#21798)

Python

• Backport Simple Stubs Codegen to 1.28. (#22310)
• [Aio] Generate gRPC AsyncIO API Reference. (#21987)
• Experimental: Implement Top-Level Invocation Functions Not Requiring an Explicit Channel. (#21954)
• [Aio] Implement health checking servicer in AsyncIO. (#22028)
• [Aio] Prohibit mixing two styles of API on client side. (#21910)
• [Aio] Add channel_ready helper function. (#21885)

... (truncated)

Changelog

Sourced from Grpc's changelog.

gRPC Release Schedule

Below is the release schedule for gRPC Java, Go and Core and its dependent languages C++, C#, Objective-C, PHP, Python and Ruby.

Releases are scheduled every six weeks on Tuesdays on a best effort basis. In some unavoidable situations a release may be delayed or a language may skip a release altogether and do the next release to catch up with other languages. See the past releases in the links above. A six-week cycle gives us a good balance between delivering new features/fixes quickly and keeping the release overhead low.

Releases are cut from release branches. For Core and Java repos, the release branch is cut two weeks before the scheduled release date. For Go, the branch is cut just before the release. An RC (release candidate) is published for Core and its dependent languages just after the branch cut. This RC is later promoted to release version if no further changes are made to the release branch. We do our best to keep head of master branch stable at all times regardless of release schedule. Daily build packages from master branch for C#, PHP, Python, Ruby and Protoc plugins are published on packages.grpc.io. If you depend on gRPC in production we recommend to set up your CI system to test the RCs and, if possible, the daily builds.

Names of gRPC releases are here.

Release	Scheduled Branch Cut	Scheduled Release Date
v1.17.0	Nov 19, 2018	Dec 4, 2018
v1.18.0	Jan 2, 2019	Jan 15, 2019

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[dependabot-preview]

Superseded by #85.