and correct --attach and --join descriptions

its relationship to small bglblocks.

the initial client eio object and later "srun --attach" objects are handled
due to the caching.

Modifications to the eio engine to move the List of eio_obj_t into the
opaque eio_handle_t.  New eio calls "eio_new_initial_obj" and
"eio_new_obj", both of which add an eio_obj_t to the eio_handle_t's internal
object List.  However, only the later function is safe to call when
the eio mainloop is running.

Also caught in this commit is some initial code to implement the RPCs
REQUEST_TERMINATE_* and REQUEST_SIGNAL_*.

moded smap to actually create correct bluegene.conf files moved checked from slurmctld job struct to the jobinfo datatype.

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.