remove unused python_tests/cuda
remove unused python_tests/cuda

niboshi/chainer,okuta/chainer,niboshi/chainer,keisuke-umezawa/chainer,niboshi/chainer,keisuke-umezawa/chainer,jnishi/chainer,ktnyt/chainer,okuta/chainer,okuta/chainer,jnishi/chainer,jnishi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,ktnyt/chainer,hvy/chainer,hvy/chainer,niboshi/chainer,chainer/chainer,wkentaro/chainer,wkentaro/chainer,tkerola/chainer,chainer/chainer,ktnyt/chainer,wkentaro/chainer,hvy/chainer,pfnet/chainer,hvy/chainer,ktnyt/chainer,chainer/chainer,okuta/chainer,chainer/chainer,keisuke-umezawa/chainer,jnishi/chainer