errors after slurmctld restarts.

Fix so slurmctld will pack correctly 2.1 step information. (Only needed if a 2.1 client is talking to a 2.2 slurmctld.)

    resources (gres).

    scheduling which prevented some jobs from starting as soon as possible.

improve wording on an option.

    select/cons_res plugin. Patch from Rod Schulz, Bull.

options and not really tested, but this is a good start

This avoids a warning message which is repeated on each reconfiguration of slurm
and which is due to a dangling group configuration in LDAP entries.

The error occurs when traversing the secondary group members of a given group
name, when trying to add these to a configured group. If these secondary group
members have no valid login (e.g. disabled via LDAP configuration), the error
is repeated on each reconfigure of slurm.

The error is harmless: since the users have no valid login, they can not log into
the system anyway. I have raised the issue described below with our LDAP admin,
there was no reply (likely since not important enough).

Since slurm is not a tool to debug the work of system administrators, and since
the secondary group members can not log in anyway, this patch replaces the error
message with a comment; it leaves untouched the positive case of found secondary
group members that have successfully been added to a configured group due to 
having a valid passwd/LDAP login entry.

Here is the case which gets repeated on our system, showing that each error message
corresponds to a 'no such user' error when trying to look up the user id:

-----------------------------------------------------------------------------------------------
[2011-03-29T08:19:35] error: Could not find user baradmin in configured group csstaff
[2011-03-29T08:19:35] error: Could not find user mvalle in configured group csstaff
[2011-03-29T08:19:35] error: Could not find user puradm in configured group csstaff
[2011-03-29T08:19:35] error: Could not find user ggobbi in configured group csappli
[2011-03-29T08:19:35] error: Could not find user mvalle in configured group csappli
-----------------------------------------------------------------------------------------------

palu2:0 ~>getent group csstaff
csstaff:*:1000:baradmin,biddisco,jfavre,mvalle,puradm
palu2:0 ~>id baradmin
id: baradmin: No such user
palu2:1 ~>id mvalle
id: mvalle: No such user
palu2:1 ~>id puradm
id: puradm: No such user

==> The secondary group members 'biddisco' and 'jfavre' are ok, no warnings.  
-----------------------------------------------------------------------------------------------
palu2:1 ~>getent group csappli
csappli:*:1010:ajocksch,alam,amangili,annaloro,biddisco,cordery,cponti,fgilles,ggobbi,grenker,jfavre,mgg,mvalle,nstring,piccinal,robinson,soumagne,tack,tadrian,uvaretto,wsawyer
palu2:0 ~>id ggobbi
id: ggobbi: No such user

When running in multiple-slurmd mode, the actual hardware configuration reported
by the slurmd is ignored, and internal entries (via register_front_ends() just
use 1 as dummy value for CPUs, sockets, cores, and threads.

On a dual-core service node this lead to continual warning messages like

[2011-04-01T10:06:40] Node configuration differs from hardware
   Procs=1:2(hw) Sockets=1:1(hw)
   CoresPerSocket=1:2(hw) ThreadsPerCore=1:1(hw)
[2011-04-01T10:07:24] Node configuration differs from hardware
   Procs=1:2(hw) Sockets=1:1(hw)
   CoresPerSocket=1:2(hw) ThreadsPerCore=1:1(hw)

This audits the select/cray code so that it does not accidentally dereference a NULL job_ptr.
This instance happens once, upon restart of slurmctld (detailed description below). 
Similar checks are also in place in other select plugins, in any case it is better to check this.
Almost all cases use xassert(), the only exception is p_job_fini(), which assumes NULL means
there is nothing to be finalized.

When running in multiple-slurmd mode, the actual hardware configuration reported
by the slurmd is ignored, and internal entries (via register_front_ends() just
use 1 as dummy value for CPUs, sockets, cores, and threads.

On a dual-core service node this lead to continual warning messages like

[2011-04-01T10:06:40] Node configuration differs from hardware
   Procs=1:2(hw) Sockets=1:1(hw)
   CoresPerSocket=1:2(hw) ThreadsPerCore=1:1(hw)
[2011-04-01T10:07:24] Node configuration differs from hardware
   Procs=1:2(hw) Sockets=1:1(hw)
   CoresPerSocket=1:2(hw) ThreadsPerCore=1:1(hw)

Since validate_nodes_via_front_end() ignores the reported values, it is safe
to use the actual hardware configuration here, which also helps with taking
stock of the current cluster configuration (e.g. via scontrol show slurmd).

After applying this patch, the slurmds report without warnings as

[2011-04-01T12:03:38] slurmd version 2.3.0-pre4 started
[2011-04-01T12:03:38] slurmd started on Fri 01 Apr 2011 12:03:38 +0200
[2011-04-01T12:03:38] Procs=2 Sockets=1 Cores=2 Threads=1 Memory=3886 TmpDisk=1943 Uptime=14355

This caused segfaults/core dumps when the slurmd/slurmctld unloaded the select/cray plugin.