Remove the dependency on u1.
Created by: dobey
This gets rid of the dependency on UbuntuOne for ubuntu-push-client, and adds a systemd unit, so that it will run on 18.04 (though I think there's nothing at the moment one can use on 18.04 to actually get a real push notification). This should take care of #2 (closed) though if it does work, and this gets backported to xenial.