Merge remote-tracking branch 'upstream/v1.2.x' into node_uv_default

CMakeLists.txt

Makefile

bazel/cc_grpc_library.bzl

bazel/generate_cc.bzl

bazel/grpc_build_system.bzl

build.yaml

gRPC-Core.podspec

gRPC-ProtoRPC.podspec

gRPC-RxLibrary.podspec

gRPC.podspec

package.json

package.xml

src/core/ext/client_channel/parse_address.c

src/core/ext/transport/chttp2/transport/chttp2_transport.c

src/core/ext/transport/chttp2/transport/parsing.c

src/core/lib/iomgr/pollset_uv.c

src/core/lib/iomgr/resolve_address_uv.c

src/core/lib/iomgr/tcp_client_uv.c

src/core/lib/iomgr/udp_server.c

src/cpp/common/version_cc.cc