Merge branch 'master' into sreek-epoll1

BUILD

bazel/grpc_build_system.bzl

src/compiler/php_generator.cc

src/compiler/php_generator.h

src/compiler/php_generator_helpers.h

src/compiler/php_plugin.cc

...core/ext/filters/client_channel/lb_policy/grpclb/grpclb.c

src/core/ext/transport/inproc/inproc_transport.c

src/core/lib/iomgr/sockaddr_utils.c

src/core/lib/iomgr/sockaddr_utils.h

src/core/lib/iomgr/tcp_server_uv.c

src/core/lib/support/env.h

src/core/lib/support/env_linux.c

src/core/lib/support/env_posix.c

src/core/lib/support/env_windows.c

src/core/lib/support/log.c

src/cpp/server/server_builder.cc

src/ruby/lib/grpc/generic/active_call.rb

src/ruby/lib/grpc/generic/bidi_call.rb

src/ruby/lib/grpc/generic/rpc_desc.rb