commit d652ccbf8195e63ff6eedb923fad060b065fd18a
author Nicolas Dichtel <nicolas.dichtel@6wind.com> Wed Apr 15 14:23:22 2015 +0200
committer Stephen Hemminger <shemming@brocade.com> Mon Apr 20 10:02:38 2015 -0700
tree 6b626838ce1eb8dab516c5015778422b5385cb32
parent b1410e0ab1b4f2f9f0b21392efc213692adf2bd5

netns: allow to dump and monitor nsid

Two commands are added:
 - ip netns list-id
 - ip monitor nsid

A cache is also added to remember the association between the iproute2 netns
name (from /var/run/netns/) and the nsid.
To avoid interfering with the rth socket, a new rtnl socket (rtnsh) is used to
get nsid (we may send rtnl request during listing on rth).

Example:
$ ip netns list-id
nsid 0 (iproute2 netns name: foo)
$ ip monitor nsid
Deleted nsid 0 (iproute2 netns name: foo)
nsid 16 (iproute2 netns name: bar)

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>