CPU frequency set race condition fix
Fix race condition in CPU frequency set with job preemption. When the preemptor job completed, it would notify the srun, which would notify the slurmctld, which could resume a preempted job. That preempted job could reset the CPU frequency before the preemptor. This change has the slurmstepd resetting a job's CPU frequency prior to notifying srun of completion, which eliminates the race condition. bug 1011
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