fix pep8 in test_attacks and use the previously unused h1 in the network.
fix pep8 in test_attacks and use the previously unused h1 in the network.

cleverhans-lab/cleverhans,openai/cleverhans,cleverhans-lab/cleverhans,cihangxie/cleverhans,carlini/cleverhans,cleverhans-lab/cleverhans,carlini/cleverhans