Add support for std_out, std_err, std_in and work_dir in the job_sumit/lua plugin

Conflicts:
	src/Makefile.am
	src/common/gres.c
	src/plugins/mpi/pmi2/spawn.c
	src/srun_cr/Makefile.am
	src/srun_cr/Makefile.in

Counts would previously go negative as jobs terminate and decrement from
a base value of zero

to EINTR when something wrong happened between the open call and
its return. By ensuring that Slurm retries on such errors, we can
better tolerate Network file systems errors at launch time.

job_submit/lua plugin: added the code to access and modify std_in, std_out, std_err and work_dir from the lua plugin.

(>5000) and using the SchedulerParameters option bf_max_job_user.

NEWS note for last few commits

an issue if you have lots of jobs that are ran by the same user.

This applies only to jobs with mutliple partitions.
It also splits up some long (over 80 character) lines
Eliminates a memory leak in the previous code
Eliminates some redundant logging messages