Add call to return non-idle processes

This is mostly for TC benefit.

Need to filter out:

Anything using less than 0.1% CPU/memory
Any process with “idle” as the command

For each process, we only keep the following (also to reduce size):

command
jail-id (if available) [for FreeBSD only, obviously, we may need to backport to 12.0 eventually so lets keep it work on both platforms]
percent-cpu
percent-memory
threads
pid

Need to evaluate if its better to use psutil or ps command.