converted packets rcvd/sent from slope positive to a calcualted delta

Calculating the time delta within the ganglia module is more reliable than using ganglia's built-in slope.  The slope function tends to give you sawtooth graphs and makes the degraded averages massively depressed. 

I see that your repo has already been pulled into zookeeper main so I'll submit this patch there too, but for consistency (and googlability) I'm submitting it to you too.