Werk #11814: smart check: Evaluate command timeouts as counter

Previously, the metric "Command_Timeout" of the smart check was evaluated in the following manner: If the counter deviated from the discovered value, the check went {CRIT}.

This led to a lot of false posivitves, as the counter may also increase after a simple reboot, which is no faulty situation. The rate however gives a better evaluation of the state. As from this werk, we allow all rates below 100 Command Timeouts per hour.

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