Fence Agents for Red Hat Cluster - heuristics ping agent

 Red Hat Fence Agents is a collection of scripts to handle remote power
 management for several devices. They allow failed or unreachable nodes to be
 forcibly restarted and removed from the cluster.
 .
 fence_heuristics_ping uses ping-heuristics to control execution of another
 fence agent on the same fencing level.
 .
 This is not a fence agent by itself. Its only purpose is to enable/disable
 another fence agent that lives on the same fencing level but after
 fence_heuristics_ping.