[collectd] Hit counter in threshold

[Andrés J. Díaz]

Hi

I've attached a patch to add hit counter to thresholds, that is, each
time when threhsold raised, then an internal hit counter is
incremented, when the value of the counter raise a specific value
setted in configuration, then the notification is generated and
counter is reset. Here are an example of threshold configuration with
hit conter:

<Threshold>
  <Plugin load>
    <Type load>
       WarninMax 1
       Hits 3
    </Type>
   </Plugin>
</Threshold>

In this example the notification will be generated when load value is
greater than 1 for 3 intervals.

Here are two patches, the first one adds hit feature to the collectd
cached and the second one use hits in thresholds,

Of course comments and suggestions are welcome :)

Enjoy!

Regards,
  Andres
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