This change enable the ss command to display the interface name as zone index
for local addresses when needed.
For this enhanced display *_diag stuff is needed.
It is based on a first version by Bernd Eckenfels.
example:
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
udp UNCONN 0 0 fe80::20c:29ff:fe1f:7406%eth1:9999 :::*
udp UNCONN 0 0 :::domain :::*
tcp LISTEN 0 3 :::domain :::*
tcp LISTEN 0 5 fe80::20c:29ff:fe1f:7410%eth2:99 :::*
Signed-off-by: Francois-Xavier Le Bail <fx.lebail@yahoo.com>