Move topology information to JGroups subsystem

In order to support topology aware clusters, the addresses generated by MuxChannel must be of type TopologyUUID, otherwise Infinispan cannot compare address topology (this currently generates a ClassCastException). Also topology must be set before the channel is started. For this reason the topology tuple (site,rack,machine) should be set at the jgroups subsystem transport configuration and the Infinispan subsystem should merely retrieve it from there.