Changes

linuxio: ude dev_port in favor of dev_id when available in net device
sysfs directories
dev_id is somehow deprecated for exposing the port number. Mostly
matters for IB devices.
Thanks to Thomas Gruber for the report.
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
(cherry picked from commit 174b5c3c1417a98225f8526bb153a2e64ccf638b)

lstopo/draw: make sure we always remove the separator between PU boxes
Some topology may have cores at level N-2 and PU at level N because a
unrelated level was placed at N-1 (for instance groups of GPU CPU-less 
NUMA node on the side). There's no easy way to force PU parents at N-1
and everything lese before.
Fix lstopo to handle that case instead of assuming PU parents are
always N-1.
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
(cherry picked from commit c9df031ab839678d739ecc7a94e63a16a1c20650)