Upmerge from v1.3.x branch to master

BUILD

build.yaml

config.m4

package.json

package.xml

src/core/lib/iomgr/tcp_server_uv.c

src/core/lib/iomgr/tcp_uv.c

src/csharp/build_packages_dotnetcli.bat

src/csharp/build_packages_dotnetcli.sh

src/node/index.js

src/node/src/protobuf_js_5_common.js

src/node/src/server.js

src/node/test/common_test.js

src/node/test/surface_test.js

src/php/ext/grpc/call.c

src/php/ext/grpc/call_credentials.c

templates/config.m4.template

templates/package.json.template

templates/package.xml.template

templates/src/csharp/build_packages_dotnetcli.bat.template