adding in codfw realm in ganglia

no doubt i've missed something and this will be one of many patchsets
adding in the multicast realm for codfw

Change-Id: Ib7aa8446734331ef50ce6187e33678440e557a1c
RT: 8201
Run webstats collector in /run/shm to reduce disk io for temp files

Change-Id: I62f0383659c90d3af1103fbc0179a84f75fa2aed
Merge "adding in codfw realm in ganglia" into production
Merge "Run webstats collector in /run/shm to reduce disk io for temp files" into production