irq plugin: Added plugin to collect interrupt counters.

irq plugin: Added plugin to collect interrupt counters.

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 Hi!

 This plugin collects interrupts from /proc/interrupts

 Usually all interrupts are collected but
 you can configure what interruptnumbers are collected or not.

 Example:

 collect only wanted irqs:

 <Plugin irq>
        Irq 0
        Irq 14
        IgnoreSelected false
 </Plugin>

 collect all but no these irqs:

 <Plugin irq>
         Irq 7
         Irq 8
         Irq 9
         IgnoreSelected true
 </Plugin>

 cu Peter
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