treat libsched_if* as a plugin, it is for mpirun on bluegene only.

    with "scontrol show job". Used in sched/wiki2.

fix to handle forwarding in the slurmd when we get an issue receiving the message after we have forwarded it.

process group).

Add OPT_BOOL environment variable type to handle yes/no 1/0 boolean
type environment variables.

the error message from GNU sleep.

when the stdout is closed.

Also add extra check to prevent the slurmstepd from sending the IO EOF
msg twice for the same object.