[Fault-injection-developer] Add set/clear irq process to ficl tool

[Gao, K. <kev...@in...>]

I have add the irq process function into fith utility.
The usage model is as follow:
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$ ficl --setirq(-s) test.xml //set irq faultset.
$ ficl --clrirq(-c)          //clear all the irq faultset.
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The format of test.xml is as follow:
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<fake_irq
    irq=3D$irq_num
    devname=3D$dev_name
    spurious_hertz=3D$spurious_hertz
    delay_hertz=3D$delay_hertz
    delay_time=3D$delay_time
/>
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-Kevin
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