Add attr.gpu to some test functions
Add attr.gpu to some test functions

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