Merge pull request #5121 from jtattermusch/refactor_dockerfiles

templates/tools/dockerfile/apt_get_basic.include

templates/tools/dockerfile/ccache_setup.include

templates/tools/dockerfile/csharp_deps.include

templates/tools/dockerfile/cxx_deps.include

templates/tools/dockerfile/node_deps.include

templates/tools/dockerfile/php_deps.include

templates/tools/dockerfile/python_deps.include

templates/tools/dockerfile/ruby_deps.include

templates/tools/dockerfile/run_tests_addons.include

...ols/dockerfile/test/csharp_jessie_x64/Dockerfile.template

.../tools/dockerfile/test/cxx_jessie_x64/Dockerfile.template

.../tools/dockerfile/test/cxx_jessie_x86/Dockerfile.template

...tools/dockerfile/test/node_jessie_x64/Dockerfile.template

.../tools/dockerfile/test/php_jessie_x64/Dockerfile.template

...ols/dockerfile/test/python_jessie_x64/Dockerfile.template

...tools/dockerfile/test/ruby_jessie_x64/Dockerfile.template

templates/tools/dockerfile/test/sanity/Dockerfile.template

tools/dockerfile/test/csharp_jessie_x64/Dockerfile

tools/dockerfile/test/cxx_jessie_x64/Dockerfile

tools/dockerfile/test/cxx_jessie_x86/Dockerfile