Werk #1926: ps: reenable compatiblity with existing configurations

In werk #1563 we moved all parameters for the process check to a check parameter rule set in normal Check_MK style. Previously these parameters (like process count, CPU levels, etc.) had been set only during discovery. Due to this werk existing configurations with rules for process inventory would not work anymore.

This werk fixes this. All old inventory (now called discovery) rules work again. Also they are ediable via WATO. Now you can set the process parameters in two places: during discovery and in the parameter rule. The preferred way is the new way: to set them in the parameter rule. That way changes will immediately get active without a need for a new discovery.

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