CPU widget - average vs. CPU-specific utilization don't seem to match up

[Hooverdan96]

This issue has been discussed a couple of times in the past on the Rockstor forums. Creating this issue based on the latest thread opened by user McFaul:

cpu usage looks inconsistent

It appears that the average CPU usage is not calculated correctly, since at the same time the CPU-specific utilization is showing a either very minimal or non-existent. I referenced some of the coding areas for this widget (see forum thread as well), which might point towards a possible solution by using a secondary data collector for average system CPU usage vs. backwards calculating it from the CPU specific one:
utilization by CPU

psutil.cpu_times_percent(interval=None, percpu=true)

vs.

psutil.cpu_times_percent(interval=None, percpu=False)

Finally, once this issue is addressed, these two requests could also be considered (via separate pull requests, but could be considered by whoever delves into this topic already):

Feature Request: Graph/Widget Changes
[New Feature] New Dashboard widget - Top running processes