Fix possible invalid memory reference in power save logic.

    NOTE: Failing on Debian Linux.
    NOTE: You must define BIND_SPECIFIC_ADDR to enable this option.

    based upon NodeAddr, ControllerAddr and BackupAddr configuration 
    parameters. Patch from Matthieu Hautreux, CEA.

    for better fault tolerance (e.g. killed and restarteed SLURM daemons on 
    compute node).

    nodes are configured in multiple leaf switches.

    launch tasks).

    with the --no-kill option.

  where needed for backwards compatibility

    file via RPC if topology/tree plugin is configured).

    which jobs can be submitted to this partition. From Matthieu Hautreux, CEA.

This patch abstracts the establishment of slurm user credentials
in slurmctld when SlurmUser != root. It adds a call to setgid()
to adopt the SLURM user's primary group, instead of running with
whatever primary group was in effect when invoking the slurmctld
executable. Also, errors in establishing user credentials are
fatal errors, instead of just warnings.

This is a minor security enhancement.