Kill $project-lb.$site.wikimedia.org and free IPs

The various $project-lb.$site.wikimedia.org hostnames and respective IPs
are unused for a long time now, having been replaced by
text-lb.$site.wikimedia.org. Remove those hostnames and free up a bunch
of old service IPs in the process.

Change-Id: I3f9bfce6e56b19e0241640cc55e9fed13218a7db