Add CPU shares & memory limit per app\cron_job

[naorlivne]

Expected/Wanted Behavior

There is no way to set an app and\or cron_job to have a limit on the amount of host resources it uses.

Actual Behavior

Nebula apps & cron_jobs should also be able to define an option mem_limit & cpu_shares to optionally limit each container usage of the host device resources (which on IoT can be scarce)

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