Add test cases that checks group hierachy of hdf5 created by save_hdf5
Add test cases that checks group hierachy of hdf5 created by save_hdf5

cupy/cupy,okuta/chainer,benob/chainer,kashif/chainer,cupy/cupy,kikusu/chainer,cupy/cupy,delta2323/chainer,aonotas/chainer,ktnyt/chainer,keisuke-umezawa/chainer,AlpacaDB/chainer,niboshi/chainer,chainer/chainer,niboshi/chainer,okuta/chainer,keisuke-umezawa/chainer,chainer/chainer,niboshi/chainer,ronekko/chainer,cemoody/chainer,chainer/chainer,wkentaro/chainer,pfnet/chainer,benob/chainer,tkerola/chainer,niboshi/chainer,wkentaro/chainer,cupy/cupy,sinhrks/chainer,chainer/chainer,jnishi/chainer,wkentaro/chainer,ysekky/chainer,kikusu/chainer,hvy/chainer,sinhrks/chainer,anaruse/chainer,hvy/chainer,okuta/chainer,okuta/chainer,jnishi/chainer,hvy/chainer,keisuke-umezawa/chainer,wkentaro/chainer,ktnyt/chainer,kiyukuta/chainer,AlpacaDB/chainer,hvy/chainer,rezoo/chainer,ktnyt/chainer,ktnyt/chainer,jnishi/chainer,jnishi/chainer,keisuke-umezawa/chainer