Werk #2987: esx_vsphere_counters: Improved accuracy of all counter values

In the previous versions the esx_vsphere_counter checks only got the last real time sample from the ESX system, which always represents a fixed interval of 20 seconds.
With this update the agent vsphere now queries the last n-samples. The number of samples is determined out of the agents check interval.
Some of the counter checks have been rewritten to handle the increased amount of data. Most of the values are simply processed to an average value, with the expection of the latency, which uses the maximum value.

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