Add links to showq command from TACC
Fix of wrong node/job state problem after reconfig

If there are completing jobs, a reconfigure will set wrong job/node
state: all nodes of the completing job will be set allocated, and the
job will not be removed even if the completing nodes are released. The
state can only be restored by restarting slurmctld after the completing
nodes released.
Add description of SSSD use with Slurm on FAQ
Merge branch 'slurm-2.6'