Provision a docker registry for use

[tayzlor]

Would be nice to have a local registry available in aws/vagrant/etc that could be used to store docker images locally to the cloud

[tayzlor]

http://container-solutions.com/2015/04/running-secured-docker-registry-2-0/

[drpauldixon]

I was looking at using haproxy for this too - something like:

   userlist registry_users
     user freddy password <encrypted password>
...

   backend registry
     balance roundrobin
     server dr1 127.0.0.1:5000 check
     acl auth_ok_for_registry http_auth(registry_users)
     http-request auth realm REG if !auth_ok_for_registry

in the haproxy config.

but managing a .htpasswd file is probably easier.

[tayzlor]

Just noting here that this should be an optional "Add-on" depends on #138 where we are creating the first plugin