Merge pull request #11954 from markdroth/service_config_dns

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

config.w32

gRPC-Core.podspec

grpc.gemspec

include/grpc/impl/codegen/grpc_types.h

package.xml

...rs/client_channel/resolver/dns/c_ares/dns_resolver_ares.c

...rs/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.c

...rs/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h

..._channel/resolver/dns/c_ares/grpc_ares_wrapper_fallback.c

src/core/lib/iomgr/gethostname.h

src/core/lib/iomgr/gethostname_fallback.c

src/core/lib/iomgr/gethostname_host_name_max.c

src/core/lib/iomgr/gethostname_sysconf.c

src/core/lib/iomgr/port.h