Scheduler fixes/updates:

 - Deduplicate the average computations in the scheduler core and the fair
   class code.

 - Fix a raise between runtime distribution and assignement which can cause
   exceeding the quota by up to 70%.

 - Prevent negative results in the imbalanace calculation

 - Remove a stale warning in the workqueue code which can be triggered
   since the call site was moved out of preempt disabled code. It's a false
   positive.

 - Deduplicate the print macros for procfs

 - Add the ucmap values to the SCHED_DEBUG procfs output for completness
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