image.go: fix duplicated import
image.go: fix duplicated import

Signed-off-by: Akihiro Suda <ea940da7e429af3d0d0c18296cabd0112a36bad5@lab.ntt.co.jp>

containerd/containerd,estesp/containerd,vdemeester/containerd,AkihiroSuda/containerd,miaoyq/containerd,kunalkushwaha/containerd,crosbymichael/containerd,thaJeztah/containerd,miaoyq/containerd,dmcgowan/containerd,hqhq/containerd,dmcgowan/containerd,kunalkushwaha/containerd,chanezon/containerd,mikebrow/containerd,thaJeztah/containerd,crosbymichael/containerd,mikebrow/containerd,estesp/containerd,containerd/containerd,rajasec/containerd,vdemeester/containerd