Fixing PacketLossLogtailer all_roles metric, also limiting the number of roles reported to ganglia via rolematcher.py

Change-Id: I805ddffca823d5d82e48e6f4370371b6a7416c0d
Merge "Fixing PacketLossLogtailer all_roles metric, also limiting the number of roles reported to ganglia via rolematcher.py" into production