Remove duplicated master test matrix
Remove duplicated master test matrix

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