Make Channel ctor private

BUILD

Makefile

build.json

include/grpc++/channel.h

src/cpp/client/channel.cc

src/cpp/client/create_channel.cc

src/cpp/client/create_channel_internal.cc

src/cpp/client/create_channel_internal.h

src/cpp/client/insecure_credentials.cc

src/cpp/client/secure_credentials.cc

tools/doxygen/Doxyfile.c++.internal

tools/run_tests/sources_and_headers.json

vsprojects/grpc++/grpc++.vcxproj

vsprojects/grpc++/grpc++.vcxproj.filters

vsprojects/grpc++_unsecure/grpc++_unsecure.vcxproj

vsprojects/grpc++_unsecure/grpc++_unsecure.vcxproj.filters