ctr: print error when pull auth fails
ctr: print error when pull auth fails

Signed-off-by: Darren Stahl <cd532073dfd182ef499598a9dfcd395d088291cb@microsoft.com>

estesp/containerd,containerd/containerd,crosbymichael/containerd,dmcgowan/containerd,mikebrow/containerd,kunalkushwaha/containerd,kunalkushwaha/containerd,vdemeester/containerd,thaJeztah/containerd,dmcgowan/containerd,crosbymichael/containerd,thaJeztah/containerd,mikebrow/containerd,estesp/containerd,miaoyq/containerd,containerd/containerd,vdemeester/containerd,miaoyq/containerd