Werk #2898: smart: Using normalized value for determining reallocated events state

The smart check often reported errors for disks which had just a small number of reallocated events but where the normalized state value (aggregated by hardware manufacturer logic) did not report an issue.

This was caused by the logic of the check which stores values the agent reports during service discovery and continously checks the difference between these values and the current values reported by the disk. In this progress the "raw values" of the smartctl output were used for all attributes.

But this seemed - at least for the "reallocated events count" - not a really good approach because the raw values may slightly change during regular operation. But small changes of the values does not necessarly mean a predicted failure. So we decided to change the logic only for the "reallocated events" now.

Maybe we need to change it for the other values in the future. But for the moment only the single value interpretation was changed.

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