Merge github.com:grpc/grpc into strong-includes

BUILD

Makefile

binding.gyp

build.yaml

config.m4

gRPC.podspec

grpc.def

grpc.gemspec

include/grpc++/security/server_credentials.h

include/grpc/grpc_security.h

include/grpc/grpc_security_constants.h

include/grpc/impl/codegen/log.h

include/grpc/support/string_util.h

package.json

package.xml

src/boringssl/err_data.c

src/compiler/cpp_generator.cc

src/compiler/cpp_generator.h

src/compiler/cpp_plugin.cc

src/core/ext/client_config/parse_address.c