is exec'ed.  This implementation is not ideal, because for switch/federation
the slurmd_step process needs to read in and parse the federation.conf file
every time the slurmd_step is exec'ed.

Added "switch_g_slurmctld_init", "switch_g_slurmd_init", and
"switch_g_slurmd_step_init" calls to the switch API.

NOTE:  The "switch_g_slurmctld_init" function is not yet called anywhere in
the slurmctld, but it also is not yet needed by any switch plugin.

be used anywhere else.

    full-system bglblock is of system size defined in bluegene.conf.

client dissapearing.  This required adding a cache of outgoing
messages so that the new srun client can see recent traffic at connection
time.

srun's "--steal" parameter is not yet supported.

Also moved the contents of "struct incoming_client_info" and 
"struct outgoing_fd_info" into the other structures.  It just looks
cleaner.

With the new stdio engine, it no longer makes sense to associate the task
stdio filenames with the srun info structure.  Instead for each task we
expand the filename format string and stick it in the slurmd_task_info_t
structure.

Add new env var SLURM_TASK_PID.

filename parameters.

Previous logic would deadlock on fork if log_init() was followed by 
log_fini() since log_fini destroys the mutex that atfork works with.