Remove importing configuration from inceptionbn.py
Remove importing configuration from inceptionbn.py

It's never used but causes flake8 error.
keisuke-umezawa/chainer,rezoo/chainer,niboshi/chainer,hvy/chainer,ysekky/chainer,keisuke-umezawa/chainer,hvy/chainer,chainer/chainer,ktnyt/chainer,keisuke-umezawa/chainer,chainer/chainer,jnishi/chainer,okuta/chainer,jnishi/chainer,hvy/chainer,okuta/chainer,okuta/chainer,ktnyt/chainer,jnishi/chainer,kashif/chainer,ronekko/chainer,tkerola/chainer,wkentaro/chainer,keisuke-umezawa/chainer,wkentaro/chainer,delta2323/chainer,chainer/chainer,chainer/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,wkentaro/chainer,pfnet/chainer,ktnyt/chainer,jnishi/chainer,ktnyt/chainer,aonotas/chainer,anaruse/chainer,niboshi/chainer,kiyukuta/chainer,wkentaro/chainer,niboshi/chainer