cluster.

Conflicts:
	src/plugins/sched/backfill/backfill.c

select()/FD_ISSET() does not work for file descriptor larger than 1023.

avoid add/remove node resource of job if the node is lost by resize

 I found another case that idle node can not be allocated. It can be
reproduced as follows:

1. run a job with -k option:

    [root@mn0 ~]# srun -w cn[18-28] -k sleep 1000
    srun: error: Node failure on cn28
    srun: error: Node failure on cn28
    srun: error: cn28: task 10: Killed
    ^Csrun: interrupt (one more within 1 sec to abort)
    srun: tasks 0-9: running
    srun: task 10: exited abnormally
    ^Csrun: sending Ctrl-C to job 106120.0
    srun: Job step aborted: Waiting up to 2 seconds for job step to
finish.

2. set a node down and then set it idle:

    [root@mn0 ~]# scontrol update nodename=cn28 state=down reason="hjcao
test"
    [root@mn0 ~]# scontrol update nodename=cn28 state=idle

3. restart slurmctld

    [root@mn0 ~]# service slurm restart
    stopping slurmctld:                                        [  OK  ]
    slurmctld is stopped
    starting slurmctld:                                        [  OK  ]

4. cancel the job

then, the node set down will be left unavailable:

    [root@mn0 ~]# sinfo -n cn[18-28]
    PARTITION AVAIL  TIMELIMIT  NODES  STATE NODELIST
    work*        up   infinite     11   idle cn[18-28]

    [root@mn0 ~]# srun -w cn[18-28] hostname
    srun: job 106122 queued and waiting for resources

    [root@mn0 slurm]# grep cn28 slurmctld.log
    [2013-03-18T15:28:02+08:00] debug3: cons_res: _vns: node cn28 in
exclusive use
    [2013-03-18T15:29:02+08:00] debug3: cons_res: _vns: node cn28 in
exclusive use

I made an attempt to fix this by the attached patch. Please review it.

I don't believe save_time_limit was redundant.  At least in this case:

if (qos_ptr && (qos_ptr->flags & QOS_FLAG_NO_RESERVE)){
    if (orig_time_limit == NO_VAL)
        orig_time_limit = comp_time_limit;
    job_ptr->time_limit = orig_time_limit;
[...]

So later, when updating the db,

    if (save_time_limit != job_ptr->time_limit)
        jobacct_storage_g_job_start(acct_db_conn,
                        job_ptr);
will cause the db to be updated, while,

        if (orig_time_limit != job_ptr->time_limit)
        jobacct_storage_g_job_start(acct_db_conn,
                        job_ptr);

will not because job_ptr->time_limit now equals orig_time_limit.

Conflicts:
	src/db_api/cluster_report_functions.c
	src/plugins/sched/backfill/backfill.c

Without this change, if the job's time limit is modified down
toward --time-min by the backfill scheduler, update the job's
time limit in the database.

Add milliseconds to default log message header (both RFC 5424 and ISO 8601
time formats). Disable milliseconds logging using the configure
parameter "--disable-log-time-msec". Default time format changes to
ISO 8601 (without time zone information). Specify "--enable-rfc5424time"
to restore the time zone information.

Add milliseconds to default log message header with the (default)
RFC5424 time format. Disable milliseconds logging using the configure
parameter "--enable-rfc5424time-secs". Sample time stamp format is as
follows: "2013-03-13T14:28:17.767-07:00".

Conflicts:
	doc/man/man1/sbatch.1

If step requests more CPUs than possible in specified node count of job
allocation then return ESLURM_TOO_MANY_REQUESTED_CPUS rather than
ESLURM_NODES_BUSY and retrying.