[PATCH] Add logging of ctdbd CPU utilisation

[Martin Schwenke]

There have been situations where ctdbd spins at 100% of a CPU thread
due to heavy contention for records.  However, without performance
logs this can't be diagnosed.

This patch will make ctdbd log CPU utilisation when it exceeds 90%.

Pipeline: https://gitlab.com/samba-team/devel/samba/pipelines/59394125

Please review and maybe push...

peace & happiness,
martin
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