Merge pull request #7210 from ctiller/no-more-zookeeper

Makefile

doc/naming.md

include/grpc/grpc_zookeeper.h

src/core/ext/resolver/zookeeper/README.md

templates/Makefile.template

templates/tools/dockerfile/run_tests_addons_nocache.include

test/build/zookeeper.c

test/cpp/end2end/shutdown_test.cc

test/cpp/end2end/zookeeper_test.cc

tools/dockerfile/grpc_check_generated_pb_files/Dockerfile

tools/dockerfile/interoptest/grpc_interop_csharp/Dockerfile

tools/dockerfile/interoptest/grpc_interop_cxx/Dockerfile

tools/dockerfile/interoptest/grpc_interop_node/Dockerfile

tools/dockerfile/interoptest/grpc_interop_php/Dockerfile

tools/dockerfile/interoptest/grpc_interop_python/Dockerfile

tools/dockerfile/interoptest/grpc_interop_ruby/Dockerfile

...ockerfile/stress_test/grpc_interop_stress_node/Dockerfile

...dockerfile/stress_test/grpc_interop_stress_php/Dockerfile

tools/dockerfile/test/csharp_coreclr_x64/Dockerfile

tools/dockerfile/test/csharp_jessie_x64/Dockerfile