Forward beta cluster UDP logs to logstash.pmtpa.wmflabs

I'm exploiting the fact that we don't have a Ganglia reporter configured for
labs to hijack the $ganglia_reporter_host template variable and use it for
routing wfDebugLog messages to logstash.pmtpa.wmflabs. I'll make this tidier in
the coming week or two.

Change-Id: I24aeb6fcc3c6be4fda1d687fb1b05afd180061a1
Merge "Forward beta cluster UDP logs to logstash.pmtpa.wmflabs" into production