Fix hpcprof corner case: single hpcrun file
Fix hpcprof corner case: single hpcrun file

Always add a measurement directory whenever hpcprof read an hpcrun file.

HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit