Fix job gres info clear on slurmctld restart

Fix bug that prevented preservation of a job's GRES bitmap on slurmctld
restart or reconfigure (bug was introduced in 14.03.5 "Clear record of a
job's gres when requeued" and only applies when GRES mapped to specific
files).
bug 1192
Merge branch 'slurm-14.03' into slurm-14.11