app/procinfo: provide way to request info on owned ports

app/procinfo: provide way to request info on owned ports

There are cases where a port maybe owned by another (failsafe, netvsc,
bond); but currently proc-info has no way to look at stats of those
ports. This patch provides way for the user to explicitly ask for these
ports.

If no portmask is given the output is unchanged; it only shows the
top level ports. If portmask requests a specific port it will be
shown even if owned.

Increase the size of port mask variable to unsigned long to
allow up to 64 ports to be handled on 64 bit architecture.

The device owner is also a useful thing to show in port info.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>