cpuShares is the relative weight wrt other apps. This is used when
there is contention for CPU. If we want this, maybe we implement
a UI where we show all the apps and let the user re-order them.
As it stands, it is confusing.
cpuQuota is a more straightforward "hard limit" of the CPU% that you
want the app to consume.
Can be tested with : stress -c 8 -t 20s
