Comment 5 for bug 1669829

Juju 2.0 has support for directly registering user's ssh keys which it will apply to all machines. (you can add keys, remove them, etc.)
It is possible that we should be looking up a user's set of keys from MAAS at some point, but the set-of-keys that can access the machine are intentionally controlled by Juju. (multi-user, etc means the set of keys that can access a machine could be entirely separate from the set of keys that deployed the machine.)