Temporary setup of new authdns servers

rubidium, mexia and eeden are the designated to become ns0/ns1/ns2.  We
already have role classes for those but this will mess up production if
prematurely applied (nagios check, ssh host keys for nsN, IPs) and they
won't work, as the scripts try to SSH to the service hostnames.

Before putting them into prod though, we'd like to run a few tests, so
add some rudimentary setup on those boxes and use the authdns class
directly from site.pp. Ugly, non-DRY but very temporary :)

Change-Id: Ide7666813b52eae9d5f8f5730d83164b838f8cc5
Merge "Temporary setup of new authdns servers" into production