ctr: drop labels from `ctr containers` subcommand list
ctr: drop labels from `ctr containers` subcommand list

The labels can be very long (e.g. cri-containerd stores a large JSON metadata
blob as `io.cri-containerd.container.metadata`) which renders the output
useless due to all the line wrapping etc.

The information is still available in `ctr containers info «name»`.

Signed-off-by: Ian Campbell <9be92b3dbbd6611e3e4c9209fb3d04b4919e7cca@docker.com>

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