message: Windows: Fix pip package installation in GPU build
  The GPU pip package name has been renamed to tensorflow_gpu-*.whl
diff: @@ -120,7 +120,7 @@ if [[ "$TF_NIGHTLY" == 1 ]]; then
  fi
  # Running python tests on Windows needs pip package installed
  -PIP_NAME=$(ls ${PY_TEST_DIR}/tensorflow-*.whl)
  +PIP_NAME=$(ls ${PY_TEST_DIR}/tensorflow_gpu-*.whl)
  reinstall_tensorflow_pip ${PIP_NAME}
  TF_GPU_COUNT=${TF_GPU_COUNT:-8}
  