sched: use runnable avg in load balance

This version resolved the aim7 liked benchmark issue by patch 8th.
Thanks for MikeG's avg_idle that is a good bursty wakeup indicator.

The first 3 patches were also include in my power aware scheduling patchset.

Morten, you can rebase your patch on this new version that bases on latest
Linus tree. :)

a git tree for this patchset:
	https://github.com/alexshi/power-scheduling.git runnablelb

Thanks
Alex

[patch v3 1/8] Revert "sched: Introduce temporary FAIR_GROUP_SCHED
[patch v3 2/8] sched: set initial value of runnable avg for new
[patch v3 3/8] sched: only count runnable avg on cfs_rq's nr_running
[patch v3 4/8] sched: update cpu load after task_tick.
[patch v3 5/8] sched: compute runnable load avg in cpu_load and
[patch v3 6/8] sched: consider runnable load average in move_tasks
[patch v3 7/8] sched: consider runnable load average in
[patch v3 8/8] sched: use instant load for burst wake up
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