comment-out $project-lb.$site revdns for unused names

This is the only legit source for lookups (some external
hosts doing rev->forward lookups on our IP space).  Getting
it out of the way allows for a clean sniffer check for any
remaining (illegitimate) DNS traffic for these names.

Change-Id: I1526dd5397fa4a69c8dc5024c611df37ce5448a4