Add converter options to convert schema1 manifest to docker schema2 manifest
Add converter options to convert schema1 manifest to docker schema2 manifest

Signed-off-by: Edgar Lee <d51c5c91b1ff5ff9fb92efe140f9c1529f321049@docker.com>

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