disable (replace) disk test

[cits.bogajewski at daimlerchrysler.com]

Hello there,

is there an option to disable specific tests, esp. disks, from hobbit 
client?  What i want to do is to replace disk test - since there no option 
actually to support alerting based on absolute values - by custom script. 

I've tried to modify your source code to support status calculation based 
on space used, but although in my imagination it was an easy task - i 
would need to take some c lessons first. :-)

Many thanks,
Anatoli