Add Get/SetCudnnMaxWorkspaceSize thread safety test
Add Get/SetCudnnMaxWorkspaceSize thread safety test

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