[collectd] processes plugin process by name - percent of all cpus feature

[William Salt]

Im using the processes plugin to find specific processes via regex, and
monitoring their cpu usage, this is the total time spent in jiffies
(milliseconds) across all cores.

In graphite, i am dividing it by the number of cpu cores i have on a
machine then turning that into percent. this gives me a percentage of total
cpu usage across all cores for that process.
However, i cannot ascertain in graphite the exact number of cpus a node
has, it differs greatly, and its not scalable to have static values in
graph query strings like this, nor efficient to work this out when
rendering a graph.

I wondered if someone could patch the plugin to allow a flag to produce the
average cpu use across all cores? grabbing the number of cpus
from /proc/cpuinfo and dividing the metric by that? bonus if it had a flag
to output a percent!

Cheers
Will
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