Best practice for Bazel builds gives one rule per target, and producing
multiple targets conflicts with this.

Short term: define macros, and common libraries that can eliminate the
duplication.

Longer term: eliminate the existing plugin registration mechanism, and
replace it with a C++ static initialization in appropriate files. This
will allow grpc to be layered strictly atop grpc_unsecure (and similarly
grpc++ atop grpc++_unsecure and grpc).

Revamp artifacts, packages and distribtests

Don't crate GRPC_OS_ERROR with a non-static string

Cleanup of the BUILD files.

Revert "Implement Server Backward Compatibility"

Implement Server Backward Compatibility

clang5 fixes

Propagate deadline to GenericServerContext

Upgrade C# to protobuf 3.3.0

Fix protoc x86 windows artifact build

Fix run_tests for C++

Add qps scenarios for better C++ large-message throughput measurement