Fix memory leak that could happen if req->cpu_bind is filled in.

This isn't the case in the current code so this isn't as big of a deal.

This logic will also be removed in 14.11 so it become less of a deal as
well, but just to be safe we cover the base.
Update HDF5 document to point out the SlurmdUser is who creates the
ProfileHDF5Dir directory as well as all it's sub-directories and files.