Create per-node global definitions for utilization variables.
This enables the tracking to more cleanly work on SMP configurations.
As resetting and starting the counters via SysBenchmarkResetLog only
updates the counters of the current thread and idle thread on the
current node it was not possible to accurately record utilization
statistics across multiple nodes. Now each node can have its tracking
independently started, stopped and queried. It is possible to add
additional syscalls in the future for doing this for all nodes in a
single syscall.
Signed-off-by: Kent McLeod <Kent.Mcleod@data61.csiro.au>
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