Sycnrhonized operations that change the value of the cluster wide cap. Added cleverRecap(...) that determines the recap value of the cluster at a much finer level, taking into account the average load on each node in the cluster. Bug fix in cap.go -- closed the session once capping had been done. This prevented from running out of file descriptors.

rapl/cap.go

@@ -26,6 +26,7 @@ func Cap(host, username string, percentage int) error {
 	}
 
 	session, err := connection.NewSession()
+	defer session.Close()
 	if err != nil {
 		return errors.Wrap(err, "Failed to create session")
 	}