[collectd] quick and dirty patch

[Łukasz Mierzwa]

Hi,

I'm using collectd but I don't like cpu graphs spread over few files, I got to 
monitor machines with different count of cpus and creating templates that 
shows all cpu usage for every kind of machine is more work than it needs to 
be, so I made this quick patch so collectd will create only one cpu graph.
Also would it be possible to implement DERIVE to data types? Now it's only 
counter and gauge.

Anyone found something better than drraw to create graphs/templates/dashboards 
from rrd files?

Łukasz Mierzwa
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