Switch the DNS testing names to "99" which helps disambiguate testing
from production, and makes you think harder about ensuring references
are abstracted properly.
The LE zone gets installed on the hidden primary, so it should just
use the inventory_hostname rather than hard-coding. Instead of
hard-coding the secondaries, we grab them from the secondary DNS
group. This should allow us to start up replacement DNS servers which
will be inactive until they are enabled for the domain.
This requires an update to the LE job, as it currently doesn't have a
secondary nameserver as part of the nodes. This means the
"adns-secondary" group is blank there. Even though this node isn't
doing anything, I think it's worth adding to cover this path (I did
consider some sort of dummy host add type thing, but that just makes
things hard to follow). We also use the 99 suffix in that job just
for consistency.
Change-Id: I1a4be41b70180deab51a3cc8a2b3e83ffd0ff1dc
0a0ca77f3b