Add missing copyright notices

templates/vsprojects/generate_debug_projects.sh

test/cpp/qps/qps-sweep.sh

test/cpp/qps/single_run_localhost.sh

tools/distrib/python/submit.py

tools/dockerfile/grpc_cxx/build.sh

tools/dockerfile/grpc_java/build.sh

tools/dockerfile/grpc_node/build.sh

tools/dockerfile/grpc_ruby/build.sh

tools/gce_setup/private_build_and_test.sh

tools/run_tests/prepare_travis.sh