Container Support

When i have a pulp3 installation with pulp_container 2.0.1 hosting a container repository and i setup a 2nd pulp3 server and try to sync from it, i get an error:

{"errors":[{"code":"UNSUPPORTED","message":"Could not satisfy the request Accept header.","detail":{}}]

It seems that pulp3 doesn't like the Accept header that the other pulp3 server is requesting:

here's the accept header from the syncing pulpcore server:

"application/vnd.docker.distribution.manifest.v2+json,application/vnd.docker.distribution.manifest.list.v2+json,application/vnd.oci.image.index.v1+json,application/vnd.oci.image.manifest.v1+json"

if i delete that header on the request (in our shim layer), it goes through fine.