Manual upmerge from v1.0.x

PHP: missed a macro

Conflicts:
	src/ruby/pb/test/client.rb
	src/ruby/pb/test/server.rb
	tools/dockerfile/test/php7_jessie_x64/Dockerfile

compare test config as objects instead of strings

update to use new nuget client in tests

backport #7502 from dgquintas/cpp_compression_level

C++ Compression Level set properly

C++ Compression Level set properly

Ruby Tools: automatically include plugin argument in protoc command

PHP: cleanup for GA

PHP: cleanup for GA

PHP: use php7_wrapper to reduce duplicated codes on v1.0.x branch(final part)

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

Remove .rb suffix from grpc-tools scripts, to be consistent with other gems

Removed --no-as-needed options from Makefile of HelloWorld and RouteGuide

Add cmake option to compile using protobuf-lite

Updated ruby protos to use new _pb filename

Avoid using certain C++11-isms with grpc::thread, as it's not necessarily std::thread.

Fixing udp test bitrotting.

After this change specifying -DGRPC_USE_PROTO_LITE=On at the cmake
command line will cause gRPC to use the protobuf-lite runtime what
can result in a major size improvement.

PHP: add PHP7 to various Jenkins tests and update dockerfile