Skip sqrt test with old numpy
Skip sqrt test with old numpy

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