PHP: use php7_wrapper to reduce duplicated codes(second part)

Add InteropTestsRemoteWithCronet to the tests

Improve error handling in handshake API

Change the default logger to the NullLogger.

PHP: use php7_wrapper to reduce duplicated codes(first part)

Convert deadline clock type in security handshake timer

It's unconventional for code to log to the console in .NET.
Even now the logging is reduced, it's still present - especially
in shutdown. This would fix #7361.

Fixing documentation typo.

PHP: add PHP7 to various Jenkins tests and update dockerfile

Be more intelligent about Cython in grpcio

We should always try to compile the protoc plugins when building tests.

update copyright

Add file to build.yaml (master)

V1.0.x merge into master

ASSERT vector size before directly accessing first element

Separate generated pb files from the server reflection build target, use grpc::protobuf instead of google::protobuf

General-purpose handshaker API.

Removed unused version of async_stream.h

Shutdown the listeners early when destroying the tcp_server