Partition Shared=YES fix

This reverts commit c773b7503f1fd23332dca035fe398d88aadeea41
Shared=, don't implicitly set job's shared field

Original code was implicitly setting a job's shared field to 1
for select/cons_res.
Fix for share partitions

Without this change, the job's --shared option when used with a partition
configuration of Shared=YES was not being honored by the select/cons_res
or select/serial plugin.
Merge branch 'slurm-14.03' of https://github.com/SchedMD/slurm into slurm-14.03