pmdalinux: use cpu instname, not instid for per-cpu numa stats
pmdalinux: use cpu instname, not instid for per-cpu numa stats

RHBZ#1730492

CPU instid does not necessarily match up with cpuid (instname)
due to directory traversal differences on different platforms
and filesystems.

QA updates following ..

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp