fix test_init_docstring to use importlib to find package
fix test_init_docstring to use importlib to find package

okuta/chainer,pfnet/chainer,hvy/chainer,jnishi/chainer,niboshi/chainer,niboshi/chainer,hvy/chainer,ktnyt/chainer,ktnyt/chainer,wkentaro/chainer,niboshi/chainer,rezoo/chainer,anaruse/chainer,okuta/chainer,hvy/chainer,chainer/chainer,jnishi/chainer,okuta/chainer,aonotas/chainer,keisuke-umezawa/chainer,ronekko/chainer,keisuke-umezawa/chainer,okuta/chainer,keisuke-umezawa/chainer,niboshi/chainer,jnishi/chainer,wkentaro/chainer,ktnyt/chainer,jnishi/chainer,wkentaro/chainer,chainer/chainer,ktnyt/chainer,tkerola/chainer,chainer/chainer,keisuke-umezawa/chainer,chainer/chainer,hvy/chainer,wkentaro/chainer