Wire up the rest of the PrologFlags=SendGIDs support.
In slurmctld: - Handle the lookup, and send results across. - Periodically flush the cache. In slurmd: - Load value sent as part of prolog into cache - Have task launch use the new call instead to fetch the jobid-cached values when available - Remove old job-specific records from the cache as part of the prolog. - Ignore the slowly increasing memory footprint from the cache, as this is what the old implementation did anyways. It'll be O(users in cluster) at worst, and flushes on a reconfigure. - Simplify the slurmstepd communication path. group_cache_lookup will always succeed. Left to do: - Convert other lookup locations in slurmd to the new approach, and remove the compatibility shim. Bug 3322.
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