Werk #6120: cisco_nexus_cpu: use the ruleset "CPU utilization for simple devices"

Since Werk 5748 cisco_nexus_cpu is preferred over cisco_cpu on all Nexus devices. As a result short peaks in CPU utilization might result in a WARN or CRIT on devices that used cisco_cpu before, since the cisco_nexus_cpu check does not deliver averaged values. To add the possibility of averaging to the cisco_nexus_cpu check the ruleset "CPU utilization for simple devices" is now used. With this ruleset it is possible to define arbitrary averaging periods. The old ruleset "CPU utilization for Appliances" is not supported anymore for the cisco_nexus_cpu check.

To accommodate for this change affected hosts have to be rediscovered and all rules for devices that use the cisco_nexus_cpu checks have to be moved to the new ruleset.

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