ctr: honor rootfs argument value when generating spec
ctr: honor rootfs argument value when generating spec

Signed-off-by: Kenfe-Mickael Laventure <10e26728841e39109c2809b6029d4b0763bd81d3@gmail.com>

vdemeester/containerd,hqhq/containerd,thaJeztah/containerd,vdemeester/containerd,mikebrow/containerd,dmcgowan/containerd,docker/containerd,rajasec/containerd,kunalkushwaha/containerd,lichao-mobanche/containerd,estesp/containerd,kunalkushwaha/containerd,containerd/containerd,thaJeztah/containerd,containerd/containerd,dmcgowan/containerd,AkihiroSuda/containerd,estesp/containerd,xiekeyang/containerd,chanezon/containerd,crosbymichael/containerd,crosbymichael/containerd,miaoyq/containerd,mikebrow/containerd,miaoyq/containerd