Manifest Lists incorrectly queried from Docker Hub

[cquon]

I was using the registry client to query manifests / manifest lists from Docker Hub. By only setting the "Accept" header to schema2 manifests, manifest lists were not correctly being returned.

ie:

$ reg manifest alpine
INFO[0000] domain: docker.io
INFO[0000] server address: https://registry-1.docker.io
{
   "schemaVersion": 2,
   "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
   "config": {
     "mediaType": "application/vnd.docker.container.image.v1+json",
     "size": 1512,
     "digest": "sha256:055936d3920576da37aa9bc460d70c5f212028bda1c08c0879aedf03d7a66ea1"
   },
   "layers": [
     {
       "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
       "size": 2757034,
       "digest": "sha256:e7c96db7181be991f19a9fb6975cdbbd73c65f4a2681348e63a141a2192a5f10"
     }
   ]
 }

When the alpine image is indeed a manifest list.

I have a follow up PR for this.

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