Filter out duplicated entries, leaving agents with the unique label names. The change is intended for the Tier-1 sites, where the set of agents on  the MSS and the Buffer nodes differ. However some agents, e.g. all central  agents are configured for both nodes, and therefore appear twice.
Filter out duplicated entries, leaving agents with the unique label names.
The change is intended for the Tier-1 sites, where the set of agents on 
the MSS and the Buffer nodes differ. However some agents, e.g. all central 
agents are configured for both nodes, and therefore appear twice.


git-svn-id: a9a8e3128c9301006a1337346ea7e68b115376f6@665 5ec1a27d-59bc-451c-a1e5-77859e3e35f3

HappyFaceMonitoring/HappyFace,HappyFaceMonitoring/HappyFace,HappyFaceMonitoring/HappyFace