Merge pull request #8125 from murgatroid99/uv_core_transport

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

gRPC-Core.podspec

grpc.gemspec

include/grpc/impl/codegen/port_platform.h

package.xml

src/boringssl/gen_build_yaml.py

src/core/ext/client_channel/connector.h

src/core/ext/client_channel/default_initial_connect_string.c

src/core/ext/client_channel/initial_connect_string.c

src/core/ext/client_channel/initial_connect_string.h

src/core/ext/client_channel/parse_address.c

src/core/ext/client_channel/parse_address.h

src/core/ext/client_channel/subchannel.c

src/core/ext/client_channel/subchannel.h

src/core/ext/client_channel/subchannel_index.c